Patent US4469724A successfully refreshed from Google Patents.
US4469724A
Expired / Lapsed
US
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Method of protecting optical fibre against stress corrosion
Assignee: United States Department of the Army
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Filing: 1983-06-29
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Granted: 1984-09-04
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Expires: 2003-06-29
Abstract
Abstract Optical fibres are protected against stress corrosion by first coating theptical fibre with a primary coating of an ultra violet curable cis, trans fluoropolyolacrylate in which the modulus is reduced by eliminating about 25 percent of the pendant ester groups, curing the primary coating, applying a secondary coating of a high modulus heat curable fluoroepoxy or a high modulus UV curable cis trans fluoropolyolacrylate over the primary coating and curing the secondary coating.
Inventors
- 👤 Liliana Klinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:00
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/1065
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
Method of protecting optical fibre against stress corrosion, said method including the steps of (A) drawing the fibre from a preform, (B) coating the drawn fibre in line in a nitrogen atmosphere with a mixture of an ultraviolet curable cis, trans fluoropolyolacrylate in which the modulus is reduced by eliminating about 25 percent of the pendant ester groups and ultraviolet catalyst for the cis, trans fluoropolyolacrylate, (C) passing the coated fibre through an ultra violet light source to cure the resin and form a primary coating while maintaining the nitrogen atmosphere, (D) coating the primary coating with a secondary coating of a member of the group consisting of a high modulus fluoroepoxy to which a curing agent has been added and a high modulus cis, trans fluoropolyolacrylate to which an ultraviolet catalyst has been added, and (E) curing the coating of step (D).
Claim 2
Dependent Claim
143 words
Method of protecting optical fibre against stress corrosion, said method including the steps of (A) drawing the fibre from a preform, (B) coating the drawn fibre in line in a nitrogen atmosphere with a mixture of an ultraviolet curable cis, trans fluoropolyolacrylate in which the modulus is reduced by eliminating about 25 percent of the pendant ester groups and ultraviolet catalyst for the cis, trans fluoropolyolacrylate, (C) passing the coated fibre through an ultra violet light source to cure the resin and form a primary coating while maintaining the nitrogen atmosphere, (D) coating the primary coating with a secondary coating of a member of the group consisting of a high modulus fluoroepoxy to which a curing agent has been added and a high modulus cis, trans fluoropolyolacrylate to which an ultraviolet catalyst has been added, and (E) curing the coating of step (D).
Claim 3
Dependent Claim
19 words
Method according to claim 1 wherein the secondary coating is cured by applying heat to the high modulus fluoroepoxy.
Claim 4
Dependent Claim
23 words
Method according to claim 1 wherein the secondary coating is cured by exposing the high modulus cis, trans fluoropolyolacrylate to ultra violet light.
Claim 5
Dependent Claim
11 words
Method according to claim 1 wherein the ultraviolet catalyst is azobisisobutyronitrile.
Claim 6
Dependent Claim
19 words
Method according to claim 1 wherein the curing agent added to the fluoroepoxy is bis (γ-amino propyl) tetramethyl disiloxane.
Claim 7
Dependent Claim
18 words
Method according to claim 1 wherein the temperature is raised to about 80° C. to cure the fluoroepoxy.
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) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |