Assignee
CHANG SING HSIUNG
3 granted patents·774 citations·filing 1976–1992
Top patents by PatentIndex Score
3 records- 0195US4343927AHydrophilic, soft and oxygen permeable copolymer compositionsCHANG SING HSIUNG·Filed 1978·Granted Aug 10, 1982·314 cites·11 claims
- 0295US4182822AHydrophilic, soft and oxygen permeable copolymer compositionCHANG SING HSIUNG·Filed 1976·Granted Jan 8, 1980·366 cites·14 claims
- 0373US5258490ANon-irritating soft gas permeable contact lens and process for producing sameCHANG SING HSIUNG·Filed 1992·Granted Nov 2, 1993·94 cites·3 claims
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