Patent US4351657A successfully refreshed from Google Patents.
US4351657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coating optical fibers with thermoplastic resin
Assignee: NTT Inc
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Filing: 1981-02-11
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Granted: 1982-09-28
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Expires: 2001-02-11
Abstract
Abstract In a process for preparing optical fibers, an optical fiber preform is heated and softened to be drawn at a high speed into an optical fiber. The optical fiber is passed through a plastic pipe of a thermoplastic resin. As the optical fiber is passed through the plastic pipe, the lower part of the plastic pipe is gradually inserted into a heating unit to be uniformly heated. The heated plastic pipe is softened and is coated over the optical fiber.
Inventors
- 👤 Takao Kimura
- 👤 Shigeki Sakaguchi
- 👤 Hisao Takata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:37
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/12; C03C25/104; C03C25/106
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
115 words
A process for preparing optical fibers comprising: drawing an optical fiber preform, which has been heated and softened, at or above a predetermined speed to form an optical fiber; continuously extruding thermoplastic resin around said optical fiber to form a continuous thermoplastic pipe having an inner diameter sufficiently large to surround said optical fiber and continuously feeding said extruded thermoplastic pipe along with said optical fiber; and passing said continuously fed optical fiber and surrounding thermoplastic pipe to a means for heating and softening part of said surrounding thermoplastic pipe to cause said heated and softened thermoplastic pipe to coat said optical fiber as said optical fiber is being fed together with said thermoplastic pipe.
Claim 2
Dependent Claim
115 words
A process for preparing optical fibers comprising: drawing an optical fiber preform, which has been heated and softened, at or above a predetermined speed to form an optical fiber; continuously extruding thermoplastic resin around said optical fiber to form a continuous thermoplastic pipe having an inner diameter sufficiently large to surround said optical fiber and continuously feeding said extruded thermoplastic pipe along with said optical fiber; and passing said continuously fed optical fiber and surrounding thermoplastic pipe to a means for heating and softening part of said surrounding thermoplastic pipe to cause said heated and softened thermoplastic pipe to coat said optical fiber as said optical fiber is being fed together with said thermoplastic pipe.
Claim 3
Dependent Claim
23 words
The process of claim 1, wherein said predetermined speed at which said optical fiber is drawn is at least 60 meters per minute.
Claim 4
Dependent Claim
40 words
The process of claim 1, wherein said continuously fed optical fiber and surrounding thermoplastic pipe which is being fed to said means for heating is fed at a speed corresponding to the speed at which said optical fiber is drawn.
Claim 5
Dependent Claim
32 words
The process of claim 1 or 3, wherein the surface of said optical fiber is treated with a silane coupling agent before it is coated with said heated and softened thermoplastic pipe.
Claim 6
Dependent Claim
30 words
The process of claim 1 or 2, wherein the pressure in the interior of said thermoplastic pipe is reduced when it is heated and softened to coat said optical fiber.
Claim 7
Dependent Claim
28 words
The process of claim 4, wherein the pressure in the interior of said thermoplastic pipe is reduced when it is heated and softened to coat said optical fiber.
Claim 8
Dependent Claim
53 words
The process of claim 1 or 2, wherein said thermoplastic resin is selected from the group consisting of styrene-butadiene copolymers, urethane-ester copolymers, ester-ether copolymers, propylene-EPDM copolymers, ethylene-vinyl acetate copolymers, polyethylene, chlorinated polyethylene, polypropylene, ethylene-propylene copolymers, polyvinylidene fluoride, polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, polymethylmethacrylate, polymethylacrylate, polyamides, polycarbonates, polyacetals, polystyrene, polyesters, polysulfones, polyethers, polyesterimides, and ABS resin.
Claim 9
Dependent Claim
22 words
The process of claim 4, wherein said thermoplastic resin is selected from the group consisting of polypropylene, tetrafluoroethylene-hexafluoropropylene copolymer, and urethane-ester copolymers.
Claim 10
Dependent Claim
22 words
The process of claim 6, wherein said thermoplastic resin is selected from the group consisting of polypropylene, tetrafluoroethylene-hexafluoropropylene copolymer, and urethane-ester copolymers.
Claim 11
Dependent Claim
28 words
The process of claim 1 or 3, wherein said optical fiber and said thermoplastic pipe are being drawn at a speed of at least 120 meters per minute.
Claim 12
Dependent Claim
21 words
The process of claim 4, wherein said optical fiber is drawn at a speed of at least 120 meters per minute.
Claim 13
Dependent Claim
21 words
The process of claim 7, wherein said optical fiber is drawn at a speed of at least 120 meters per minute.
Claim 14
Dependent Claim
21 words
The process of claim 8, wherein said optical fiber is drawn at a speed of at least 120 meters per minute.
Claim 15
Dependent Claim
21 words
The process of claim 9, wherein said optical fiber is drawn at a speed of at least 120 meters per minute.
Claim 16
Dependent Claim
54 words
The process of claim 1 or 3, wherein said optical fiber and surrounding heated and softened thermoplastic pipe are passed through a forming die to reduce the diameter of said thermoplastic pipe and to coat said optical fiber with said thermoplastic pipe and to regulate the outer diameter of the thermoplastic coated optical fiber.
Claim 17
Dependent Claim
52 words
The process of claim 7, wherein said optical fiber and surrounding heated and softened thermoplastic pipe are passed through a forming die to reduce the diameter of said thermoplastic pipe and to coat said optical fiber with said thermoplastic pipe and to regulate the outer diameter of the thermoplastic coated optical fiber.
Claim 18
Dependent Claim
52 words
The process of claim 10, wherein said optical fiber and surrounding heated and softened thermoplastic pipe are passed through a forming die to reduce the diameter of said thermoplastic pipe and to coat said optical fiber with said thermoplastic pipe and to regulate the outer diameter of the thermoplastic coated optical fiber.
Claim 19
Dependent Claim
52 words
The process of claim 11, wherein said optical fiber and surrounding heated and softened thermoplastic pipe are passed through a forming die to reduce the diameter of said thermoplastic pipe and to coat said optical fiber with said thermoplastic pipe and to regulate the outer diameter of the thermoplastic coated optical fiber.
Claim 20
Dependent Claim
52 words
The process of claim 14, wherein said optical fiber and surrounding heated and softened thermoplastic pipe are passed through a forming die to reduce the diameter of said thermoplastic pipe and to coat said optical fiber with said thermoplastic pipe and to regulate the outer diameter of the thermoplastic coated optical fiber.
References Cited (Backward Citations)
US3227032A
Cited
DE2414009A1
Cited
US4115087A
Cited
US4118212A
Cited
NL7804448A
Cited
US4208200A
Cited
US4289516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |