US2869010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interference type optical filters utilizing calcium fluoride
Assignee: RCA Corp
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Filing: 1955-04-28
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Granted: 1959-01-13
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Expires: 1975-04-28
Abstract
No abstract record available.
Inventors
- 👤 Gray Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:08
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/285; H; H04; H04N; H04N23/00; H04N23/10; H04N23/12; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/45; H01J29/86; H01J29/89
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
59 words
A PHOTOSENSITIVE DEVICE COMPRISING A FILM OF A PHOTOSENSITIVE MATERIAL SUPERIMPOSED UPON AN INTERFERENCE LIGHT FILTER, SAID FILTER COMPRISING ALTERNATE STRATA OF A HIGH REFRACTIVE INDEX MATERIAL AND A LOW REFRACTIVE INDEX MATERIAL, EACH OF SAID STRATA BEING APPROXIMATELY A WHOLE NUMBER OF QUARTER WAVELENGTHS OF GREEN LIGHT IN EFFECTIVE OPTICAL THICKNESS, SAID LOW INDEX MATERIAL BEING CALCIUM FLOURIDE.
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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) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |