DR

Donald J. Ratkowski

PO Paragon Optical: 5 patents #1 of 3Top 35%
PH Pilkington Barnes Hind: 2 patents #4 of 14Top 30%
SU Sola Usa: 2 patents #2 of 14Top 15%
PV Pilkington Visioncare: 1 patents #5 of 35Top 15%
Overall (All Time): #400,213 of 4,157,543Top 10%
12
Patents All Time

Issued Patents All Time

Showing 1–12 of 12 patents

Patent #TitleCo-InventorsDate
D1093538 Pointed recoil spring guide for pistol 2025-09-16
5519069 Contact lenses and materials and methods of making same William J. Burke, Lisa A. Folk 1996-05-21
5505884 Contact lenses and materials and methods of making same William J. Burke, Lisa A. Folk 1996-04-09
5170192 Oxygen permeable bifocal contact lenses and their manufacture Lisa A. Pettigrew, William J. Burke, Joseph I. Weinschenk, III 1992-12-08
5087392 Method of mold contact lenses William J. Burke, Lisa A. Folk 1992-02-11
4921205 Lens mold assembly Arthur J. Drew, Jr. 1990-05-01
4769431 Polyacryloxyalkylsilanol lens composition, articles and method of manufacture 1988-09-06
4661573 Lens composition articles and method of manufacture William J. Burke 1987-04-28
4582884 Lens composition, article and method of manufacture 1986-04-15
4535138 Silane ester contact lens composition, article and method of manufacture Ping Lue 1985-08-13
4419505 Contact lens composition, article and method of manufacture Ping Lue 1983-12-06
4254065 Injection molding of contact lenses 1981-03-03