Patent US2269578A successfully refreshed from Google Patents.
Patent US3092002A successfully refreshed from Google Patents.
US3092002A
Expired / Lapsed
US
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Shutter for photographic apparatus
Assignee: Individual
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Filing: 1960-09-23
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Granted: 1963-06-04
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Expires: 1980-09-23
Abstract
No abstract record available.
Inventors
- 👤 Frenk Helmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:27
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/36; G03B9/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A SHUTTER FOR PHOTOGRAPHIC APPARATUS COMPRISING A PAIR OF SHUTTER BLADES, AN A.C. SOURCE, A FIRST CIRCUIT CONNECTED WITH SAID A.C. SOURCE, A PLURALITY OF SERIES CONNECTED ELECTRIC MAGNETS IN SAID FIRST CIRCUIT, PHASE SHIFTING MEANS IN SAID FIRST CIRCUIT DISPLACING THE PHASE OF CURRENT AS SUPPLIED BY SAID A.C. SOURCE BY 90*, AMPLIFIER MEANS IN SAID FIRST CIRCUIT, A SECOND CIRCUIT CONNECTED WITH SAID A.C. SOURCE, AMPLIFIER MEANS AND ANOTHER PLURALITY OF SERIES CONNECTED ELECTRIC MAGNETS IN SAID SECOND CIRCUIT, SAID SECOND PLURALITY OF ELECTRIC MAGNETS BEING DISPOSED IN ALTERNATING SPACED ARRANGEMENT WITH SAID FIRST PLURAITY OF ELECTRIC MAGNETS, AND ALL OF SAID MAGNETS BEING SPACED PERIPHERALLY ABOUT SAID SHUTTER BLADES.
Claim 2
Dependent Claim
112 words
A SHUTTER FOR PHOTOGRAPHIC APPARATUS COMPRISING A PAIR OF SHUTTER BLADES, AN A.C. SOURCE, A FIRST CIRCUIT CONNECTED WITH SAID A.C. SOURCE, A PLURALITY OF SERIES CONNECTED ELECTRIC MAGNETS IN SAID FIRST CIRCUIT, PHASE SHIFTING MEANS IN SAID FIRST CIRCUIT DISPLACING THE PHASE OF CURRENT AS SUPPLIED BY SAID A.C. SOURCE BY 90*, AMPLIFIER MEANS IN SAID FIRST CIRCUIT, A SECOND CIRCUIT CONNECTED WITH SAID A.C. SOURCE, AMPLIFIER MEANS AND ANOTHER PLURALITY OF SERIES CONNECTED ELECTRIC MAGNETS IN SAID SECOND CIRCUIT, SAID SECOND PLURALITY OF ELECTRIC MAGNETS BEING DISPOSED IN ALTERNATING SPACED ARRANGEMENT WITH SAID FIRST PLURAITY OF ELECTRIC MAGNETS, AND ALL OF SAID MAGNETS BEING SPACED PERIPHERALLY ABOUT SAID SHUTTER BLADES.
References Cited (Backward Citations)
US2702500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-03 | 1966-12-03 | 1967-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-03 | 1970-12-03 | 1971-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-03 | 1974-12-03 | 1975-06-04 | $7700.00 | Window Closed / Lapsed |