US3205803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 04:21
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
References Cited (Backward Citations)
US3124049A
Cited
US2179717A
Cited
US2258994A
Cited
US2428566A
Cited
US2856831A
Cited
GB830755A
Cited
US2961597A
Cited
GB864320A
Cited
US3020816A
Cited
AT225515B
Cited
US2999445A
Cited
US3056332A
Cited
US3143046A
Cited
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 |