US4099835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical fibers with helical gradations in composition
Assignee: AT&T Inc
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Filing: 1976-10-08
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Granted: 1978-07-11
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Expires: 1996-10-08
Abstract
Abstract This application discloses a technique for producing optical fibers with longitudinal variations in index of refraction. The deposition apparatus is arranged to allow for the formation of an intertwined double helix of two different materials. The technique does not require imposing any time dependent conditions on the fabrication apparatus.
Inventors
- 👤 William George French
- 👤 John Burnette MacChesney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:13
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/01413; C03B37/0142; C03C; C03C13/00; C03C13/001; C03C13/04; C03B2203/00; C03B2203/10; C03B2203/18; C03B2203/20; C03B2203/32; C03B2203/36; C03B2207/00; C03B2207/04; C03B2207/06; C03B2207/20; C03B2207/50; C03B2207/60; G02B6/02057; G02B6/02076; G02B6/0208; G02B6/02085; G02B2006/0209; G02B6/028; G02B6/0288
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
An optical fiber with a transmitting core comprising a first helical region intertwined about at least one other second helical region, the index of refraction values of the first helical region being different than the index of refraction values of the second helical region along substantially the entire boundary between the two helical regions, the length of the longitudinal gradation in the resulting fiber being between one and ten millimeters.
Claim 2
Dependent Claim
70 words
An optical fiber with a transmitting core comprising a first helical region intertwined about at least one other second helical region, the index of refraction values of the first helical region being different than the index of refraction values of the second helical region along substantially the entire boundary between the two helical regions, the length of the longitudinal gradation in the resulting fiber being between one and ten millimeters.
Claim 3
Dependent Claim
20 words
The device of claim 1 wherein the index of refraction of at least one of the helical regions is constant.
Claim 4
Dependent Claim
23 words
The device of claim 1 wherein the index of refraction of at least one of the helical regions varies along the axial direction.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |