US3719462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light guide paths comprising densified regions in a transparent medium;and method of producing
Assignee: AT&T Inc
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Filing: 1970-12-21
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Granted: 1973-03-06
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Expires: 1990-12-21
Abstract
Abstract STRESSING METHOD INVOLVES SURFACE SCRIBBING AS BY A DIAMOND INDENTER. A SECOND STRESSING METHOD EMPLOYS A RIBBED DIE. ELEMENTAL PATHS THUS CONSTRUCTED ARE DESCRIBED. THIS DISCLOSURE DESCRIBES A METHOD FOR CONSTRUCTING SMALL-SCALE LIGHT GUIDE ELEMENTS BY ACHIEVING THE NEEDED REFRACTIVE INDEX CHANGE THROUGH A PROCESS OF SELECTIVE DENSIFICATION IN THE OPTICAL MEDIUM. THE MATERIAL IMMEDIATELY BENEATH THE SURFACE OF THE MEDIUM IS STRAINED A CONTROLLED AMOUNT ALONG A DESIRED PATH, PRODUCING A CORRESPONDING PERMANENTLY DENSIFIED ZONE THEREUNDER. ONE
Inventors
- 👤 G Fisher
- 👤 P Andreatch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:50
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/13; C; C03; C03C; C03C23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |