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ZILA RESOLVES PERIGEL PATENT LITIGATION

 PHOENIX, Nov. 30 /PRNewswire/ -- Zila Pharmaceuticals, Inc., a division of Zila, Inc. (NASDAQ: ZILA) today announced it has resolved patent litigation it initiated in June 1992, relating to Zila's twin- tube baking soda and peroxide dentifrice, PeriGel(R). The litigation dealt with patents held by Block Drug and subsequently Chesebrough- Pond's USA. As a result, Zila has been granted a license to sell PeriGel under the Chesebrough-Pond's patent. PeriGel formerly lacked patent coverage.
 Zila initiated the suit in response to correspondence from Block Drug suggesting that PeriGel infringed upon Block's patents. Zila filed a declaratory judgement action in Federal District Court seeking a judicial determination that PeriGel did not infringe upon any valid patent rights held by Block Drug. Later, because of Block's assignment of one of its related patents to Chesebrough-Pond's, the latter company was added to the suit.
 Zila and Block settled their dispute several months ago, with each party agreeing to release all claims against the other. Today's announcement reflects the resolution of the remaining issues between Zila and Chesebrough-Pond's. Both parties have agreed to terminate the litigation.
 Zila President Joseph Hines said, "During its course, this litigation required the investment of a considerable amount of cash and management time. With this matter behind us, we can again focus all of our resources on expanding Zila's growth and profit."
 -0- 11/30/93
 /CONTACT: Joseph Hines, president of Zila, 602-266-6700/
 (ZILA)


CO: Zila Pharmaceuticals, Inc.; Block Drug; Chesebrough-Ponds USA ST: Arizona IN: MTC SU:

LD -- NY010 -- 8576 11/30/93 09:02 EST
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Publication:PR Newswire
Date:Nov 30, 1993
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