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Crystal Semiconductor Corporation v. Tritech Microelectronics International, Inc.

The court affirmed that an electronics company infringed three patents owned by another electronics company for analog-to-digital converter technology.

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Appealed from: United States District Court for the Western District of Texas

Judge Sam Sparks

On a motion for partial summary judgment, the United States District Court for the Western District of Texas determined that OPTi Inc.’s (OPTi’s) and TriTech Microelectronics International, Inc.’s (TriTech’s) accused devices literally infringe Crystal Semiconductor Corporation’s (Crystal’s) U.S. Patent Nos. 4,746,899 (’899 patent) and 5,220,483 (’483 patent). See Crystal Semiconductor Corp. v. OPTi, Inc., No. A 97-CA-026 SS (W.D. Tex. Apr. 20, 1999). After the close of evidence but before the case went to the jury, the district court granted judgment as a matter of law (JMOL) that Crystal’s U.S. Patent No. 4,851,841 (the ’841 patent) was not invalid due to an on-sale bar. See Crystal Semiconductor Corp. v. OPTi, Inc., No. A 97-CA-026 SS (W.D. Tex. May 12, 1999).

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