US3606544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractive shutter for rotating prism cameras
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1969-08-18
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Granted: 1971-09-20
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Expires: 1989-08-18
Abstract
Abstract A ROTATING PRISM IS USED AS A SHUTTER TO INTERMITTENTLY TRANSMIT LIGHT TO FILM THAT IS MOVED IN TIMED RELATION WITH THE ROTATING PRISM SHUTTER. THE PRISM SHUTTER CONTAINS AN INTERFACE BETWEEN TWO MEDIA OF DIFFERENT INDEX OF REFRACTION. THE INTERFACE ORIENTATION AND THE INDEX OF REFRACTION TO PASS LIGHT ARE ADJUSTED SUCH THAT DESIRABLE LIGHT PASSING THROUGH THE PRISM WILL MEET THE INTERFACE AT AN ANGLE OF INCIDENCE WHICH IS LESS THAN THE CRITICAL ANGLE, AND, HENCE, WILL PASS THROUGH THE INTERFACE. UNWANTED LIGHT WILL BE INCIDENT TO THE INTERFACE AT AN ANGLE GREATER THAN THE CRITICAL ANGLE AND, HENCE, WILL BE TOTALLY REFLECTED AND NOT PASS THROUGH THE INTERFACE.
Inventors
- 👤 Joseph H Arndt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:45
CPC Classifications
G; G03; G03B; G03B41/00; G03B41/02; G03B41/04; G03B41/08; G03B35/00; G03B35/18; G03B35/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |