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Technology Stocks : Kopin Corp. (KOPN)

KOPN 2.275

+2.9%

Nov 21 9:30 AM EST

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To: John Finley who wrote (943)	11/14/1999 4:12:00 PM
From: kinkblot	Read Replies (2) of 1820

Keeping the Lid on Lift-off Those CEA patents are public documents. The lift-off process used by Kopin is proprietary, in the sense 'privately owned and controlled'. Kopin uses the following phrase in their SEC filings, for example in their S-3/A Prospectus, page 23: This single crystal silicon is not grown on glass; rather, it is first formed on a silicon wafer and then lifted off as a thin film using our proprietary technology. Some of the M.I.T. patents licensed to Kopin do cover a lift-off process (CLEFT). It's based on epitaxy, not implantation. See: U.S. #4,727,047 issued 02/23/88 to Bozler et al., Method of producing sheets of crystalline material patents.ibm.com This invention "relates to the production of sheets of crystalline material, particularly thin sheets of crystalline semiconductor material grown epitaxially on single crystal substrates which can be optionally reuseable." I believe this is the earliest one; subsequent patents build on it. CLEFT ~ Cleavage of Lateral Epitaxial Film for Transfer Are they still using this approach? Enquiring minds want to know. WT

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