Flexible contact lens
US4062627A · kind A · utility
22Cited by
7References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1975 |
| Grant date | Dec 13, 1977 |
| Priority date | — |
| Expiry date | Nov 18, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F283/128
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An improved flexible contact lens is provided having hydrophilic and lipophobic properties which allow extended duration of wear by eliminating or greatly reducing the risk of rupture of the natural tear film produced by the cornea. These properties are achieved by crosslinking a selected water soluble polymer which has been grafted onto a pre-formed substrate, for example crosslinking polyvinyl pyrrolidone which has been previously grafted onto a silicone substrate. The grafting and the crosslinking are accomplished in separate stages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.