US3597046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated light permeable optical component
Assignee: GTE Sylvania Inc
•
Filing: 1968-09-27
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Granted: 1971-08-03
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Expires: 1988-09-27
Abstract
Abstract A coated light permeable refractive medium for use in an optical system to discretely attenuate radiant energy beamed from a controlled light source whereof an area of metallic coating is disposed on at least one surface of the medium by photosensitive deposition. The light attenuation characteristics of the refractive optical component are formed in the photosensitive coating by the irradiation pattern of the light source in the system.
Inventors
- 👤 Harry E Smithgall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:35
CPC Classifications
G; G02; G02B; G02B3/00; H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; H01J9/2272
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
47 words
A light permeable variable density filter component according to claim 1 wherein said gray-black central coating area does not exceed substantially 75 percent light attenuation to pass a nominal transmittance of luminous irradiation that is above the activation threshold of the light sensitive material comprising said screen.
References Cited (Backward Citations)
US2356694A
Cited
US1469931A
Cited
GB508011A
Cited
US2655452A
Cited
US2960015A
Cited
US3039349A
Cited
US3149968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |