Joseph W. Wittmann

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Rochester, NY, US

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Patents Grantslast 30 patents

Information Patent Grant
Tinted contact lens and method for preparation with dichlorotriazin...
- Patent number 4,891,046
- Issue date Jan 2, 1990
- CooperVision, Inc.
- Joseph W. Wittmann
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Oxygen permeable hard contact lens
- Patent number 4,508,884
- Issue date Apr 2, 1985
- CooperVision, Inc.
- Joseph W. Wittmann
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Cured cellulose ester, method of curing same, and use thereof
- Patent number 4,454,295
- Issue date Jun 12, 1984
- UCO Optics, Inc.
- Joseph W. Wittmann
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Cured cellulose ester, method of curing same, and use thereof
- Patent number 4,395,496
- Issue date Jul 26, 1983
- UCO Optics, Inc.
- Joseph W. Wittmann
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...