Incident light filter for cameras
US4473289A · kind A · utility
12Cited by
3References
4Claims
0Family size
Inventor
Key dates
| Filing date | Mar 24, 1983 |
| Grant date | Sep 25, 1984 |
| Priority date | — |
| Expiry date | Mar 24, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B11/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Presented in several different aspects is an incident light filter or cap assembly adapted to be attached over the lens of a camera for the purpose of permitting adjustment of the camera controls in view of the incident light conditions that exist at the time the picture is taken.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.