Mold for fixing a metal block on one of the faces of an ophthalmic lens
US4844143A · kind A · utility
4Cited by
8References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Mar 25, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T279/31
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The cylindrical side wall of the mold cavity (8) has an inside diameter (D) which is greater than the largest existing ophthalmic lens diameter, and a generally cylindrical membrane (25) of elastomer material is disposed concentrically inside the mold cavity so that in conjunction with the cylindrical side wall of the cavity it defines a variable volume annular chamber (31), the membrane being expansible and retractable radially under the action of a fluid which is alternatively removed from and admitted to the annular chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.