Patent US3105428A successfully refreshed from Google Patents.
US3105428A
Expired / Lapsed
US
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Backlighting and reflectance error compensation devices
Assignee: Bell and Howell Co
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Filing: 1961-06-12
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Granted: 1963-10-01
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Expires: 1981-06-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Mervin W La Rue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:26
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/4209; G01J1/4214; G01J1/02; G01J1/04; G01J1/06; G03; G03B; G03B7/00; G03B7/08; G03B7/099; G03B7/0993
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
IN AN AUTOMATIC EXPOSURE CONTROL FOR A CAMERA HAVING A PREDETERMINED OPTICAL AXIS AND INCLUDING A MAIN PHOTOCELL, GRID MEANS HAVING A PLURALITY OF CELLS EXTENDING GENERALLY PARALLEL TO THE OPTICAL AXIS AND POSITIONED IN
Claim 2
Dependent Claim
35 words
IN AN AUTOMATIC EXPOSURE CONTROL FOR A CAMERA HAVING A PREDETERMINED OPTICAL AXIS AND INCLUDING A MAIN PHOTOCELL, GRID MEANS HAVING A PLURALITY OF CELLS EXTENDING GENERALLY PARALLEL TO THE OPTICAL AXIS AND POSITIONED IN
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-30 | 1967-04-01 | 1967-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-30 | 1971-04-01 | 1971-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-30 | 1975-04-01 | 1975-10-01 | $7700.00 | Window Closed / Lapsed |