Optical instrument, in particular binoculars
US4993820A · kind A · utility
0Cited by
8References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1988 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Jul 12, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The optical instrument, in particular binoculars, is characterized by exhibiting an integral stable inner housing including the eyepiece tube, the objective tube, the prism seat and possibly the hinge mechanism. The inner housing is encased in plastic foam which determines the outer contour of the instrument.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.