US3208078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic sky light balancing in camera exposure control
Assignee: Bell and Howell Co
•
Filing: 1963-01-07
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Granted: 1965-09-21
•
Expires: 1983-01-07
Abstract
No abstract record available.
Inventors
- 👤 Henry J Koeber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:15
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/087
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN A CAMERA INCLUDING LENS MEANS FOR DIRECTING AN IMAGE LIGHT BEAM ONTO A PHOTOGRAPHIC FILM BEHIND ANN APERTURE INTERMITTENTLY OPENED AND CLOSED BY A SHUTTER, BEHIND THE LENS AUTOMATIC EXPOSURE CONTROL MEANS INCLUDING LIGHT-SENSITIVE PHOTOCONDUCTIVE CELL MEANS, AND MEANS FOR DIRECTING THE GROUND LIGHT PORTIONS OF THE IMAGE BEAM AT SUBSTANTIALLY FULL VALUE TO THE PHOTOCONDUCTIVE CELL BUT DE-EMPHASIZING THE SKY LIGHT PORTIONS OF THE LIGHT BEAM, WHEREBY TO ATTAIN SUBSTANTIAL GROUNDD-SKY LIGHT BALANCE IN THE OPERATION OF THE AUTOMATIC EXPOSURE CONTROL MEANNS.
Claim 2
Dependent Claim
84 words
IN A CAMERA INCLUDING LENS MEANS FOR DIRECTING AN IMAGE LIGHT BEAM ONTO A PHOTOGRAPHIC FILM BEHIND ANN APERTURE INTERMITTENTLY OPENED AND CLOSED BY A SHUTTER, BEHIND THE LENS AUTOMATIC EXPOSURE CONTROL MEANS INCLUDING LIGHT-SENSITIVE PHOTOCONDUCTIVE CELL MEANS, AND MEANS FOR DIRECTING THE GROUND LIGHT PORTIONS OF THE IMAGE BEAM AT SUBSTANTIALLY FULL VALUE TO THE PHOTOCONDUCTIVE CELL BUT DE-EMPHASIZING THE SKY LIGHT PORTIONS OF THE LIGHT BEAM, WHEREBY TO ATTAIN SUBSTANTIAL GROUNDD-SKY LIGHT BALANCE IN THE OPERATION OF THE AUTOMATIC EXPOSURE CONTROL MEANNS.
References Cited (Backward Citations)
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FR880520A
Cited
GB661261A
Cited
FR1184474A
Cited
US3029689A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |