US3809686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent media capable of photoinduced refractive index changes and their application to light guides and the like
Assignee: AT&T Inc
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Filing: 1972-03-01
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Granted: 1974-05-07
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Expires: 1992-03-01
Abstract
Abstract THERE ARE DISCLOSED A VARIETY OF METHODS FOR PRODUCING LIGHT GUIDES INSUITABLE SENSITIZED SAMPLES UPON IRRADIATION WITH FOCUSED ULTRAVIOLET LIGHT AND SUBSEQUENT AGING. THESE METHODS ARE BASED UPON THE RECOVERY THAT ULTRAVIOLET RADIATION FROM A MERCURY ARC AT 3650 A. OR FROM AN ULTRAVIOLET HELIUM-CADMIUM ION LASER AT 3250 A. PRODUCES READILY OBSERVABLE IRREVVERSIBLE INDEX OF REFRACTION CHANGES IN POLY(METHYL METHACRYLATE) POLYMERIZED AT LOW TEMPERATURES OF AROUND 40-50 DEGRESS CENTIGRADE. UPON SUBSEQUENT AGING THE AMOUNT AND GRADIENT OF THE INDEX CHANGE SUBSTANTIALLY INCREASE.
Inventors
- 👤 E Chandross
- 👤 W Tomlinson
- 👤 R Fork
- 👤 I Kaminow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:40
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/122; G02B6/1221; G02B6/02; G02B6/02057; G02B6/02076; G02B6/02114; G02B6/02123; G02B6/13; G02B6/138; G03; G03F; G03F7/00; G03F7/004; G03F7/038
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |