US3606521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for compensating for angular variation of dichroic mirror characteristics
Assignee: INTERNATIONAL VIDEO CORP
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Filing: 1970-03-11
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Granted: 1971-09-20
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Expires: 1990-03-11
Abstract
Abstract AN OPTICAL FILTER INCLUDING A DICHROIC TRANSMISSION FILTER AND A DICHROIC REFLECTING MIRROR, THE TRANSMISSION FILTER HAVING SUBSTANTIALLY THE SAME LIGHT-PASSING CHARACTERISTICS SO THAT AS THE ANGLE OF INCIDENCE BETWEEN A BEAM AND THE REFLECTING MIRROR IS VARIED, VARIATION IN THE REFLECTION CHARACTERISTICS OF THE OPTICAL SYSTEM IS SUBSTANTIALLY REDUCED. D R A W I N G
Inventors
- 👤 Skipwith W Athey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:27
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/26; G02B5/28; G02B5/285; G03; G03B; G03B33/00; G03B33/10; G03B33/12; G05; G05G; G05G1/00; G05G1/04; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/261
Claims Analysis
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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) | 1974-09-19 | 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 |