Patent US3205803A successfully refreshed from Google Patents.
US3205803A
Expired / Lapsed
US
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Shutter timing apparatus
Assignee: Polaroid Corp
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Filing: 1963-03-29
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Granted: 1965-09-14
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Expires: 1983-03-29
Abstract
No abstract record available.
Inventors
- 👤 John P Burgarella
- 👤 Jeremy M Topaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:59
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
A PHOTOGRAPHIC SHUTTER MECHANISM COMPRISING: (A) AN INTEGRATOR CIRCUIT INCLUDING A PHOTOCONDUCTOR EXPOSED TO THE SCENE BEING PHOTOGRAPHED AND A MAIN TIMING CAPACITOR CONNECTED TO DEVELOP A TIME-VARIABLE VOLTAGE AT A RATE DEPENDENT ON THE RESISTANCE OF SAID PHOTOCOUDUCTOR; (B) A SHUTTER FOR INITIATING AND TERMINATING EXPOSURE THROUGH AN EXPOSURE APERTURE; (C) MEANS RESPONSIVE TO GHE DEVELOPMENT OF A PREDETERMINED VOLTAGE CROSS SAID MAIN TIMING CAPACITOR TO CAUSE SAID SHUTTER TO TERMINATE EXPOSURE; AND (D) COMPENSATION IMPEDANCE MEANS IN PARALLEL WITH THE MAIN TIMING CAPACITOR OF SAID INTEGRATOR CIRCUIT TO LIMIT EXPOSURE ERROR BY REDUCING THE DIFFERNCE
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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) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |