US3177497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed responsive exposure control in a motton picture camera
Assignee: Bell and Howell Co
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Filing: 1960-12-19
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Granted: 1965-04-06
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Expires: 1980-12-19
Abstract
No abstract record available.
Inventors
- 👤 Paul J Richartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:02
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
IN A MOTION PICTURE CAMERA, AN OPTICAL OBJECTIVE, A SHUTTER, TWO-SPEED SHUTTER DRIVE MEANS INCLUDING A GOVERNOR INCLUDING A PLURALITY OF BALLS OF MAGNETIC MATERIAL REVOLVED IN A PREDETERMINED PATH, MANUAL CONTROL MEANS FOR SELECTIVELY SETTING THE SHUTTER DRIVE MEANS AT EACH OF THE TWO SPEEDS, EXPOSURE CONTROL MEANS, PHOTOELECTRIC MEANS RESPONSIVE TO SCENE LIGHTING FOR CONTROLLING THE EXPOSURE CONTROL MEANS, COIL MEANS HAVING A MAGNETIC CORE POSITIONED ADJACENT TO THE PATH SO THAT THE BALLS REVOLVING PAST THE CORE GENERATE VOLTAGE IN THE COIL, AND SWITCH MEANS OPERABLE BY THE MANUAL CONTROL MEANS FOR CONNECTING THE COIL MEANS IN OPPOSITION TO THE PHOTOELECTRIC MEANS WHEN THE SHUTTER IS DRIVEN AT ITS HIGHER SPEED.
Claim 2
Dependent Claim
114 words
IN A MOTION PICTURE CAMERA, AN OPTICAL OBJECTIVE, A SHUTTER, TWO-SPEED SHUTTER DRIVE MEANS INCLUDING A GOVERNOR INCLUDING A PLURALITY OF BALLS OF MAGNETIC MATERIAL REVOLVED IN A PREDETERMINED PATH, MANUAL CONTROL MEANS FOR SELECTIVELY SETTING THE SHUTTER DRIVE MEANS AT EACH OF THE TWO SPEEDS, EXPOSURE CONTROL MEANS, PHOTOELECTRIC MEANS RESPONSIVE TO SCENE LIGHTING FOR CONTROLLING THE EXPOSURE CONTROL MEANS, COIL MEANS HAVING A MAGNETIC CORE POSITIONED ADJACENT TO THE PATH SO THAT THE BALLS REVOLVING PAST THE CORE GENERATE VOLTAGE IN THE COIL, AND SWITCH MEANS OPERABLE BY THE MANUAL CONTROL MEANS FOR CONNECTING THE COIL MEANS IN OPPOSITION TO THE PHOTOELECTRIC MEANS WHEN THE SHUTTER IS DRIVEN AT ITS HIGHER SPEED.
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) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |