US3560082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical inverting systems
Assignee: NAT RES DEV
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Filing: 1969-11-05
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Granted: 1971-02-02
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Expires: 1989-11-05
Abstract
Abstract A DEVICE FOR PRODUCTION FROM AN ENTERING LIGHT BEAM TWO EMERGING BEAMS WHICH ARE MUTUALLY INVERTED WITH RESPECT TO A STRAIGHT LINE DEFINED BY THE DEVICE. THE ENTERING BEAM IS SPLIT AT A FIRST SEMI-REFLECTING FILM INTO TWO COMPONENT BEAMS, WHICH ARE RESPECTIVELY REDIRECTED ONTO OPPOSITE FACES OF A SECOND SEMI-REFLECTING FILM SEPARATE FROM THE FIRST BY MEANS OF TWO SIMILAR AND SIMILARLY ORIENTATED REVERSING REFLECTORS, FOR EXAMPLE ROOF PRISMS, WHICH ARE SET OPTICALLY ORTHOGONAL TO EACH OTHER AND DISPOSED TO GIVE EQUAL LENGTHS FOR THE TWO COMPONENT BEAMS BETWEEN THE TWO FILMS.
Inventors
- 👤 James Morriss Burch
- 👤 John William Charles Gates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:15
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/14; G02B27/144
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |