Apple’s New “Heat Exchangers in Sapphire Processing Patent” and the Secret Design of the Mesa Sapphire Matrix

Posted: April 4, 2014 by mattmargolis24 in Apple Investor Information, GTAT Investor Information, Mesa Sapphire Plant
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by Matt Margolis

An Apple patent for continuous sapphire growth was brought to light earlier today and believe it or not Apple is not done improving the economic cost of making high volume sapphire.  Apple was granted a heat exchangers in sapphire processing patent on March 20, 2014.  The patent allows for sequentially arranging one sapphire growth furnace to heat a second furnace to process aluminum oxide.  Additionally, the invention allows for the creation of a heating system composed of a heat battery and a “plurality” of furnaces.  The heating system further includes an insulated network of piping in communication with the heat battery and each of the plurality of furnaces. Heat is transferred within the system between the heat battery and the plurality of furnaces via the network of piping and the heat exchangers.   Apple has patented the ability to create large network of sapphire growth furnaces that are fully integrated from a central heat battery and heat source.  Apple’s contractors have likely been retrofitting the facility with a matrix of integrated piping that will travel from the heater to the “heat battery” and flow to each individual furnace assembled and installed within the facility.  I recently reported that the Mesa facility has 9 distinct phases and it now appears clearer that each phase will be designed and assembled to custom fit the sapphire growth needs for each section.  What is even more interesting is the new patent for heat exchangers can be applied to each of the various sapphire growth processes.   Some highlights and images provided within the heat exchangers in sapphire processing patent are listed below:


Systems and methods are presented for efficient heating during production of corundum. One embodiment may take the form of a system for processing corundum including a first furnace and a second furnace. The first and second furnaces are sequentially arranged and heat from the first furnace is subsequently used to heat the second furnace.


Another embodiment may take the form of a method of operating multiple furnaces in sapphire processing. The method includes operating a first furnace and routing heat from the first furnace to a second furnace. The heat from the first furnace preheats the second furnace. The method also includes operating the second furnace subsequent to the operation of the first furnace.


One embodiment may include linking all heating and cooling systems of the growers and furnaces together so that much less heat is wasted and greater efficiencies could be realized. Specifically, furnaces (either or both annealing and growth furnaces) could have their heating and cooling systems linked to other systems through heat exchanges. By staggering the processing schedules among groups of machines, heat that is removed from one furnace could be fed directly into another furnace to reduce the energy input requirement of its heating step. This could be achieved using some thermal fluid (water/pressurized steam, alcohol, solutions, molten salts, and so on) and an insulated network of piping within a cell of linked machines. As used herein, the term “furnace” may generally refer to a heating system or device which facilitates achieving temperatures for either growth or annealing of sapphire. As such, the furnaces referred to herein may include heat sources (e.g., heating elements), insulation, crucibles, and so forth.


Yet another embodiment may take the form of a heating system for sapphire production. The heating system includes a heat battery and a plurality of furnaces. Each furnace includes a heat exchanger. The heating system further includes an insulated network of piping in communication with the heat battery and each of the plurality of furnaces. Heat is transferred within the system between the heat battery and the plurality of furnaces via the network of piping and the heat exchangers.


Some common and distinct growth methods include Kyropoulos, Verneuil , Czochralski, flux, heat exchange method (“HEM”), hydrothermal, vertical horizontal gradient freezing (“VHGF”), Stepanov (i.e., edge-defined film-fed growth (“EFG”)), and Bridgman (i.e., horizontal moving growth). The Kryopoulos, Verneuil, Czochralski, flux, and hydrothermal processes generate a sapphire boule, whereas the EFG, VHGF and horizontal moving growth processes generate sapphire members having continuous cross-sections. It should be appreciated that although specific examples described herein may refer to a particular process for sapphire growth the examples are not intended to be limiting. As such, the present techniques, systems and methods may be used in conjunction with each of the various sapphire growth processes.


Figure 8 below shows how the Mesa facility is likely laid out with a continuous flow of piping and interconnected sapphire growth furnaces and annealing furnaces with equipment closely lined up in an organized matrix to form the most impressive sapphire production facility in the world.




Figure 9 below exhibits how Apple can automate the process to take heat from the first furnace and heat a second first and then taking the heat from the second furnace to heat a new first furnace.  You need to think of the the mathematical constant known as Pi because this invention allows for a limitless amount of heat to be transferred from one furnace to the next furnace



Mosaic Theory

I’m going to apologize in advance on this one but I cannot stay inside the box whatsoever.  Some of you have commented on the Mosaic theory and I’m going to attempt to push the limits in my next few items.

Apple has patented a process to use a “heat battery,” what is a heat battery?  According to a 2011 report researchers have found a way to turn the sun’s energy, geo-thermal energy or even fuel cell energy by using the thermochemical approach.  The thermochemical approach takes energy that is captured in the configuration of certain molecules which can then release energy on demand to produce usable heat.  And unlike conventional solar-thermal systems, which require very effective insulation and even then gradually let the heat leak away, the heat-storing chemicals could remain stable for years.  Some details from the 2011 report are below:

In effect, explained Grossman, this discovery makes it possible to produce a “rechargeable heat battery” that can repeatedly store and release heat gathered from sunlight or other sources. In principle, Grossman said, a fuel made from fulvalene diruthenium, when its stored heat is released, “can get as hot as 200 degrees C, plenty hot enough to heat your home, or even to run an engine to produce electricity.”

Compared to other approaches to solar energy, he said, “it takes many of the advantages of solar-thermal energy, but stores the heat in the form of a fuel. It’s reversible, and it’s stable over a long term. You can use it where you want, on demand. You could put the fuel in the sun, charge it up, then use the heat, and place the same fuel back in the sun to recharge.”


Apple is reportedly using solar power and geo-thermal energy to help power the Mesa Facility.  According to the contract document Apple will be using fuel cells, roof solar arrays, a solar basin and an Electrical Substation to manage the power supply to the Mesa sapphire facility.

Landlord further reserves a right of entry as reasonably necessary to maintain, repair, operate and monitor (or to cause the applicable utility provider to do the same) the Roof Solar Array, the Solar Basin, the Fuel Cell, and the Electrical Substation


GT Advanced recently posted an Electrical Engineer / PLC Controls position (see image below) on their website to focus on “Electrical design for power control and power distribution” and to “Provide support for customers as they configure their plant control systems to interface with our equipment.”  This new position also requires “Experience with industrial power systems including transformers, power controllers, and distribution equipment”.  Apple appears to have invented a new heat exchangers process that will rely on using a centralized “heat battery” can hold energy and would need to be distributed and interfaced with GT’s sapphire growth equipment inside Mesa.



Apple and GT Advanced Technology have in my opinion designed and developed the most integrated and comprehensive sapphire growth facility in the world.  Apple’s recent patents, specifically the  continuous sapphire growth and the heat exchangers in sapphire processing patent are game changers in terms of yield per furnace and cost per sapphire cover screens.   I want everyone to picture the Mesa Matrix with me.  You are envisioning miles of large piping installed within the facility that will carry heat from a heater to the “heat battery,” where the energy and power can be managed by a switch.  The heat battery will carry the heat necessary to grow the sapphire and operate the annealing furnaces.

On top of the matrix of integrated piping to carry the heat to the furnaces to grow the sapphire crystal each furnace has a continuous supply of raw ingredients and heat to grow sapphire around the clock 24/7 and produce beautiful ribbons or sheets of sapphire crystals.  We need to remember that the heat exchangers patent can be applied to various sapphire growth methods including EFG and VHGF.  Per the Cradley Crystals website, “EFG method for growing sapphire is used for growing sapphire of any given shape, including tubes, rods, sheets, and fibers. EFG technology makes it possible to get unique shapes and sealed assemblies”.   Yes, I repeat any shape including sheets or tubes.

Figure 8 depicts the continuous growth process to load alumina into the crucible that will produce sapphire growth ribbons (sheets).


Figure 6 depicts cutting the sapphire ribbons (sheets) that have been grown outside of the growth chamber.



Apple has managed to take an independent ASF sapphire growth furnace that produces 200 kg+ boule every 25 days and turn their Mesa sapphire factory into a sapphire growth matrix.  Apple has patented a way to create an integrated heating process taking energy provided by mother earth, store it, manage the power and send the energy in the form of heat through miles of piping within the Mesa, AZ sapphire facility to power thousands of furnaces in a way no one ever thought possible.  In addition to the game changing method to provide heat to a sapphire growth furnace, Apple has patented a process that can continuously grow sheets of sapphire crystal in ANY shape their hearts desire.  Apple’s Mesa facility production design will significantly lower the cost of growing sapphire crystals due to the continuous sapphire growth method.  The patently process will result in less waste, easier fabrication process as well as a significant increase in sapphire crystal yield per sapphire furnace.  The continuous sapphire growth patent eliminates the need to start and stop up batch runs to produce sapphire boules, which dramatically increase the sapphire yield per furnace.  The sapphire sheets will significantly reduce the fabrication costs versus the cost to harvest a sapphire cover screen from a sapphire boule.  The amount of sapphire produced from a ASF furnace will also increase due to the unique shape and form of the sapphire sheets that are produced.

This invention is like going from a bread maker in the year 1700 to a bread maker in the year 2014.  The bread maker in 1700, mixed the ingredients by hand, used an open flame and made bread in a crucible.  After each loaf of bread was baked the bread maker had to clean out the crucible, restart the fire and bake each loaf one by one.  Conversely, the 2014 bread maker has an assembly line that takes the raw ingredients and mixes them in a massive storage container.  The container has automated process to express the mixed ingredients into crucibles that are shaped any which way.  The crucibles carrying the ingredients are carried along an automated belt to a very large oven that transforms the raw ingredients into bread as the crucibles pass through the oven.

The key point here is you can throw out any previous calculation on cost of sapphire screens, because the method being used by every other sapphire growth manufacturer is still stuck in the year 1700.  Apple and GT have advanced the design and method to grow sapphire by hundreds of years so to speak.   The sapphire that will be produced at the Mesa sapphire facility owned by Apple and operated by GT will be mind-blowing.   These new patent developments open up the door that Apple can cover any iDevice they want with sapphire crystal in 2014.  Apple and GT have revolutionized the sapphire crystal growth process and it’s time for me to take off my cap and give both companies a standing ovation for their innovation, vision and ability to deliver game changing technology at an affordable price!


I hope you have all enjoyed the journey through the Mesa Sapphire Matrix and that each and every one of you now has a full vision of what it will look inside Apple’s 1.3 million square foot sapphire manufacturing facility.




Full Disclosure I am long GTAT and have no plans to buy or sell any holdings in the next 72 hours











  1. pat says:



  2. Dan says:

    great research my friend…


  3. Barry Fitzgerald says:


    Missoula Montana? How is that job posting so surely for the Apple plant?



    • It’s not just for Apple but it’s for assignments like Apple and other customers. The job calls for living in Montana and “still have the opportunity to travel worldwide”. PLC is used for electromechanical processes including factory assembly lines.


  4. steve says:

    Matt, This is all very interesting, but it feels like AAPL is locking up GTAT’s furnaces from the remaining market. Perhaps that is ok but feeling boxed nontheless.


    • Steve is that concerning? The materials business with Apple is significantly larger versus the off of lower furnace sales. If Apple adopts sapphire across their platform of devices the revenue will be well north of $2b annually.


    • Barry Fitzgerald says:

      I find it interesting that Apple owns patents in GTAT technology area. How did this come about? It implies that Apple either bought them or has a tech team in sapphire processing….any idea here?


      • Apple has been hiring sapphire experts for the last 2+ years. It seems like they have deployed these experts in the field to design and improve the sapphire growing process.


      • Barry Fitzgerald says:

        But, but , but don’t they know Gorilla glass is better???? (J/K) 🙂


      • Apple knows sapphire wasn’t a available in 2006 has been waiting until someone like GTAT came along that could deliver the goods at the right price and yield.


  5. bwkoenig says:

    Matt – Great article, as usual. I’m still confused as to who owns what at the Mesa plant. I know the building is Apple’s but is all the equipment inside Apple’s too? Is GTAT simply paid to run the operation? If so, does GTAT really gain all the revenue from the sale of sapphire to Apple?



    • GT owns their furnaces and most likely the fabrication, annealing, testing equipment. GT buys the raw materials. Apple owns the lasers for cutting, the building, the “heat battery”, the piping. The diamond wire saws could do either way at this point as to who owns. GT will run the patented operation that Apple has designed (I’m sure with GT’s assurance). This facility will be one of a kind and won’t be able to be duplicated. GT will make money growing and processing the sapphire and selling the finished sapphire good to Apple. There is potential GT could receive extra $ for adding the protective coating to the sapphire as well.


  6. […] Apple’s New “Heat Exchangers in Sapphire Processing Patent” and the Secret Design … […]


  7. […] Apple’s New “Heat Exchangers in Sapphire Processing Patent” and the Secret Design … […]


  8. ronfab1 says:

    Matt, your research on this joint venture for sapphire production between Apple and GT Advanced Technologies has been amazing and this particular article to me is just astonishing with how they are advancing the state of the art in this field. If this is an Apple patent for the design of the Mesa heat exchanging matrix, does that not mean as well that nowhere else outside of Apple facilities, would GT be allowed to consult and help other companies set up similar operations with equipment purchased from GT? I am a little confused from your comment copied below concerning the position of the engineer GT was looking to and probably already hired for a Montana facility.

    “It’s not just for Apple but it’s for assignments like Apple and other customers. The job calls for living in Montana and “still have the opportunity to travel worldwide”. PLC is used for electromechanical processes including factory assembly lines.”


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