Patent Granted for Asymmetrical Wafer Configurations for Rubicon Technology

  Patent Granted for Asymmetrical Wafer Configurations for Rubicon Technology

    Provides Tactile and Visual Indicators for Sapphire Wafer Orientation

Business Wire

BENSENVILLE, Ill. -- March 28, 2013

Rubicon Technology, Inc. (NASDAQ:RBCN), a leading provider of sapphire
substrates and products to the LED, semiconductor, and optical industries,
today announced that the United States Patent and Trademark Office (USPTO) has
granted a patent to Rubicon entitled, “Asymmetrical Wafer Configurations and
Method for Creating the Same,” U.S.PatentNo. 8,389,099. The patent covers
the creation of visual and tactile indicators to make sapphire wafers
asymmetric according to their crystalline orientation.

Sapphire wafers have specific orientation that is invisible to the naked eye.
Rubicon has developed a simple, yet elegant, process to make wafers appear
asymmetrical via visual or tactile inspection. This is important as LED and
semiconductor manufacturers process sapphire wafers using specific crystalline
orientations. The patent helps manufacturers in the LED and SoS/RFIC
industries eliminate costly and unnecessary steps to determine orientation of
sapphire wafers during processing, such as x-ray crystallography.

Epitaxy-ready wafers have either an orientation flat or an orientation notch,
but this provides insufficient information: the wafer could be flipped
front-to-back and still look the same yet be unusable in that state
crystallographically. Only through repeated x-ray inspections could the
manufacturer ensure that no wafers are reversed. If the wafers are made
asymmetrical, operators at each stage of production can verify surface
orientation quickly and economically, and will be confident that the wafers
have been handled correctly.

Rubicon’s patent demonstrates several different solutions for making sapphire
wafers asymmetric. In one solution, a rounded corner on the orientation flat
or notch allows a user to easily determine that the wafer has not been
reversed. In another solution, both corners of the flat are rounded to
different radii. These differences are enough to determine orientation by
touch or visual inspection. The technique can be applied to other substrates
including silicon, silicon oxide, aluminum nitride, germanium, silicon
carbide, gallium arsenide, gallium phosphide, gallium nitride, and amorphous

“This new patent demonstrates our ongoing commitment to refine our products
for our customers and deliver innovations that deliver real value,” said Raja
M. Parvez, President and CEO of Rubicon Technology. “For Rubicon’s customers
in the LED and SoS/RFIC markets, the crystal orientation is a critical factor
in their manufacturing processes. This patent provides a simple and elegant
solution to eliminating costly mistakes in the processing of sapphire wafers.
It underscores our dedication to not only provide high quality sapphire
wafers, but to provide our customers with added value to lower the total cost
of LED and RF solutions.”

About Rubicon Technology

Rubicon Technology, Inc. is an advanced electronic materials provider that is
engaged in developing, manufacturing and selling monocrystalline sapphire and
other crystalline products for light-emitting diodes (LEDs), radio frequency
integrated circuits (RFICs), blue laser diodes, optoelectronics and other
optical applications. The Company applies its proprietary crystal growth
technology to produce very high-quality sapphire in a form that allows for
volume production of various sizes and orientations of substrates and windows.
Rubicon is a vertically-integrated manufacturer with capabilities in crystal
growth, high precision core drilling, wafer slicing, surface lapping,
large-diameter polishing and wafer cleaning processes, which the Company
employs to convert the bulk crystal into products with the quality and
precision specified by its customers. The Company is the world leader in
larger diameter products to support next-generation LED, RFIC and optical
window applications.

Further information is available at


Rubicon Technology, Inc.
Dee Johnson, 847-457-3426
Vice President, Investor Relations
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