US3091164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic apparatus
Assignee: Polaroid Corp
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Filing: 1960-09-26
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Granted: 1963-05-28
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Expires: 1980-09-26
Abstract
No abstract record available.
Inventors
- 👤 Edison R Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:13
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN A SHUTTER MECHANISM IN WHICH THE EXPOSURE TIME INTERVAL IS A FUNCTION OF THE SPEED OF MOVEMENT OF A MOVEABLE MEMBER FORMING A PORTION OF SAID SHUTTER MECHANISM, A DEVICE FOR CONTROLLING THE EXPOSURE TIME INTERVALS COMPRISING, IN COMBINATION, A DISPLACEABLE FLUID THE APPARENT VISCOSITY OF WHICH IS VARIABLE IN ACCORDANCE WITH THE DEGREE OF MAGNETIZATION THEREOF, MOVABLE MEANS COUPLED WITH SAID MOVABLE MEMBER FOR MOVING SAID FLUID, THE SPEED OF MOVEMENT OF SAID MOVABLE MEANS BEING A FUNCTION OF SAID VISCOSITY, AND MEANS FOR PREDETERMINEDLY MAGNETIZING SAID FLUID FOR CONTROLLING THE VISCOSITY THEREOF SO AS TO EFFECT CHANGES IN SAID EXPOSURE TIME INTERVALS.
Claim 2
Dependent Claim
105 words
IN A SHUTTER MECHANISM IN WHICH THE EXPOSURE TIME INTERVAL IS A FUNCTION OF THE SPEED OF MOVEMENT OF A MOVEABLE MEMBER FORMING A PORTION OF SAID SHUTTER MECHANISM, A DEVICE FOR CONTROLLING THE EXPOSURE TIME INTERVALS COMPRISING, IN COMBINATION, A DISPLACEABLE FLUID THE APPARENT VISCOSITY OF WHICH IS VARIABLE IN ACCORDANCE WITH THE DEGREE OF MAGNETIZATION THEREOF, MOVABLE MEANS COUPLED WITH SAID MOVABLE MEMBER FOR MOVING SAID FLUID, THE SPEED OF MOVEMENT OF SAID MOVABLE MEANS BEING A FUNCTION OF SAID VISCOSITY, AND MEANS FOR PREDETERMINEDLY MAGNETIZING SAID FLUID FOR CONTROLLING THE VISCOSITY THEREOF SO AS TO EFFECT CHANGES IN SAID EXPOSURE TIME INTERVALS.
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) | 1966-05-27 | 1966-11-26 | 1967-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-27 | 1970-11-26 | 1971-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-27 | 1974-11-26 | 1975-05-28 | $7700.00 | Window Closed / Lapsed |