Computer lens block and method of forging
US4459784A · kind A · utility
Inventors
Key dates
| Filing date | Nov 13, 1978 |
| Grant date | Jul 17, 1984 |
| Priority date | — |
| Expiry date | Nov 13, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24B13/005
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A lens block used to secure an opthalmic lens during its formation by conventional forming equipment wherein the lens block comprises an integrally formed single piece structure of hardened metal material having centering means including a plurality of linearally aligned apertures each having a substantially conical configuration formed directly in the surface of the lens block oppositely disposed to the surface which is interconnected to the lens itself. The lens block is formed from a powdered metal material comprised of hard metal alloys which is sintered and heat treated to attain a desired condition of particle hardness in the upper range of the Rockwell C Scale.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.