Soft contact lens
US4650843A · kind A · utility
23Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1985 |
| Grant date | Mar 17, 1987 |
| Priority date | — |
| Expiry date | Jan 2, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
When trifluoroethyl methacrylate, hexafluoroisopropyl methacrylate, pentafluoro-n-propyl methacrylate and/or pentafluoro-n-butyl methacrylate which are fluorine-containing monomers, are added to a conventional monomer mixture for producing a soft contact lens, the resulting soft contact lens has the same optical properties and elasticity as conventional soft contact lenses have, and is very superior to the conventional ones in resistance to deposit and in shape stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.