Patent US3778361A successfully refreshed from Google Patents.
US3778361A
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Process for rendering transparent media artificially opalescent and resulting product
Assignee: AT&T Inc
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Filing: 1972-09-01
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Granted: 1973-12-11
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Expires: 1992-09-01
Abstract
Abstract AN OPALESCENT EFFECT IS CREATED ARTIFICIALLY IN SUITABLE BULK MATERIAL BY THE INTERFERENCE OF TWO BEAMS DIRECTED INTO THE MATERIAL AT THE BRAGFG ANGLE. OPTICAL ENERGY IS THUS CONCENTRATED ALONG DESIRED PLANES AND A PLANAR ALTERATION OF REFRACTIVE INDEX ALONG THESE PLANES IS ACHIEVED. SUITABLE BULK MATERIALS INCLUDE POLYMETHYL METHACRYLATE. A GENERAL CLASS OF SUITABLE MATERIALS IS CHARACTERIZED. PRODUCTION TECHNIQUES ARE SET FORTH. D R A W I N G
Inventors
- 👤 Courtney-Pratt J Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:24
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/26; G03H1/30; B; B29; B29C; B29C71/00; B29C71/04; G02; G02B; G02B1/00; G02B1/10; G02B1/12; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0838; B29K; B29K2033/00; B29K2033/04; B29K2033/12; B29K2995/00; B29K2995/0018; B29K2995/0026; B29K2995/0031; B29L; B29L2031/00; B29L2031/743; B29L2031/7432; G03H1/04; G03H1/0476; G03H2001/0482; G03H1/0493; G03H2001/0497; G03H2224/00; G03H2224/06; G03H2240/00; G03H2240/20; G03H2240/23; G03H2240/24; G03H2270/00; G03H2270/10; G03H2270/11; G03H2270/14; Y; Y10; Y10S; Y10S522/00; Y10S522/913
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |