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Donald J. Ratkowski
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Chandler, AZ, US
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Patents Grants
last 30 patents
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Patent Grant
Contact lenses and materials and methods of making same
Patent number
5,519,069
Issue date
May 21, 1996
Pilkington Barnes Hind, Inc.
William J. Burke
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Contact lenses and materials and methods of making same
Patent number
5,505,884
Issue date
Apr 9, 1996
Pilkington Barnes Hind Inc.
William J. Burke
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Oxygen permeable bifocal contact lenses and their manufacture
Patent number
5,170,192
Issue date
Dec 8, 1992
Pilkington Visioncare, Inc.
Lisa A. Pettigrew
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Method of mold contact lenses
Patent number
5,087,392
Issue date
Feb 11, 1992
Sola USA, Inc.
William J. Burke
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Polyacryloxyalkylsilanol lens composition, articles and method of m...
Patent number
4,769,431
Issue date
Sep 6, 1988
Paragon Optical Inc.
Donald J. Ratkowski
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Lens composition articles and method of manufacture
Patent number
4,661,573
Issue date
Apr 28, 1987
Paragon Optical Inc.
Donald J. Ratkowski
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Lens composition, article and method of manufacture
Patent number
4,582,884
Issue date
Apr 15, 1986
Paragon Optical, Inc.
Donald J. Ratkowski
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Silane ester contact lens composition, article and method of manufa...
Patent number
4,535,138
Issue date
Aug 13, 1985
Paragon Optical, Inc.
Donald J. Ratkowski
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Contact lens composition, article and method of manufacture
Patent number
4,419,505
Issue date
Dec 6, 1983
Paragon Optical, Inc.
Donald J. Ratkowski
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...