Annular gasket for moulding lenses for organic material
US4251474A · kind A · utility
43Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 21, 1980 |
| Grant date | Feb 17, 1981 |
| Priority date | — |
| Expiry date | Feb 21, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An annular gasket for use in the moulding of ophthalmic or optical lenses of organic material, comprises two axially spaced ridges on its inner periphery arranged to cooperate tightly with two mould shells. At least one of the annular ridges is formed at the end of an elastically deformable annular flange extending around the inner periphery at an angle to the axis of the gasket. The flange projects both from a corresponding transverse face of the gasket and from its internal peripheral face.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.