Patent US4154783A successfully refreshed from Google Patents.
US4154783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing dielectric optical waveguides
Assignee: Post Office
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Filing: 1977-07-25
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Granted: 1979-05-15
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Expires: 1997-07-25
Abstract
Abstract A method of coating a fibre in which a sleeve of polymer is extruded, fibre is fed into the sleeve as it is formed, and the diameter of the sleeve is reduced by a drawing process to produce a sleeve of polymer which loosely envelops the fibre. We also provide a fibre having a tubular sleeve of polymer, the sleeve having its molecules orientated to lie longitudinally with respect to the axis of the fibre. The sleeve has relative strength in a longitudinal plane and relative weakness in a transverse plane.
Inventors
- 👤 Lynden A. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:03
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00663; B29D11/00711; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/06; B29C48/09; B29C48/15; B29C48/25; B29C48/256; B29C48/2562; B29C48/30; B29C48/32; B29C48/34; B29C48/88; B29C48/91; B29C48/911; B29C48/919; B29C55/00; B29C55/22; C; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/106; C03C25/12; C03C25/18; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4479; G02B6/4483; G02B6/4486
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
95 words
A method of coating a dielectric optical waveguide which comprises: feeding an optical waveguide through a cross-die extruder; extruding a sleeve of polymer around the waveguide as it passes through the extruder, the internal diameter of the sleeve being substantially greater than the diameter of the waveguide and the molecules of the sleeve being orientated to lie longitudinally of the sleeve; reducing by a drawing process the internal diameter of the sleeve to such an extent that it loosely envelops the waveguide; and passing the waveguide and its loosely enveloping sleeve through an annealing oven.
Claim 2
Independent Claim
95 words
A method of coating a dielectric optical waveguide which comprises: feeding an optical waveguide through a cross-die extruder; extruding a sleeve of polymer around the waveguide as it passes through the extruder, the internal diameter of the sleeve being substantially greater than the diameter of the waveguide and the molecules of the sleeve being orientated to lie longitudinally of the sleeve; reducing by a drawing process the internal diameter of the sleeve to such an extent that it loosely envelops the waveguide; and passing the waveguide and its loosely enveloping sleeve through an annealing oven.
Claim 3
Dependent Claim
17 words
A method as claimed in claim 1 wherein the sleeve is heated as its diameter is reduced.
Claim 4
Dependent Claim
26 words
A method as claimed in claim 2 wherein the sleeve is passed through a cooling bath after it is extruded and before its diameter is reduced.
Claim 5
Dependent Claim
17 words
A method as claimed in claim 1 wherein said dielectric waveguide is cleaned prior to being coated.
References Cited (Backward Citations)
FR2102419A5
Cited
DE2110934A1
Cited
GB1371740A
Cited
JPS508732A
Cited
US3993726A
Cited
US3936519A
Cited
US4017579A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |