Collapsible spectacles
US4820035A · kind A · utility
18Cited by
3References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1985 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Feb 28, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C5/2263
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides spectacles in which the distance between two lens frames (1)(2) is variable and which has holders (7)(7a) on the lens frame, a bridge (8) slidably fitted in the holder for connecting the lens frames together and holding means (9) for determining the effective length of the bridge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.