US3689264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for increasing index of refraction in transparent bodies and its application to light guides and the like
Assignee: AT&T Inc
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Filing: 1970-03-19
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Granted: 1972-09-05
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Expires: 1990-03-19
Abstract
Abstract THE ARE DISCLOSED A VARIETY OF METHODS FOR PRODUCING LIGHT GUIDES IN SUITABLY SENSITIZED SAMPLES UPON IRRADIATION WITH FOCUSED ULTRAVIOLET LIGHT AND SUBSEQUENT AGING. THESE METHODS ARE BASED UPON THE DISCOVERY THAT ULTRAVIOLET RADIATION FROM A MERCURY ARC AT 3650 A. OR FROM AN ULTRAVIOLET HELIUM-CADMIUM ION LASER AT 3250A. PRODUCES READILLY OBSERVABLE IRREVERSIBLE INDEX OF REFRACTION CHANGESIN POLY(METHYL METHACRYLATE) POLYMERIZED AT LOW TEMPERATURES OF AROUND 40-50 DEGREES CENTIGRADE. UPON SUBSEQUENT AGING, THE AMOUNT AND GRADIENT OF THE INDEX CHANGE SUBSTANTIALLY INCREASE.
Inventors
- 👤 Edwin Arthur Chandross
- 👤 Richard Lynn Fork
- 👤 Ivan Paul Kaminow
- 👤 Walter John Tomlinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:48
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; G02B6/24; G02B6/26; G02B6/28; G02B6/2804; G02B6/2821; G02B6/30; G03; G03F; G03F7/00; G03F7/0005; G03F7/001; G03F7/004; G03F7/038
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |