US4137949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a fire retardant conduit
Assignee: General Electric Co
•
Filing: 1977-05-11
•
Granted: 1979-02-06
•
Expires: 1997-05-11
Abstract
Abstract A conduit such as a metal or flexible material fuel or oil tube is provided with a barrier to metallic fires through the use of the combination of carbon or graphite impregnated with a polymer resin to provide insulative as well as ablative characteristics.
Inventors
- 👤 Peter J. Linko, III
- 👤 Stanley C. Harrier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:40
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/04; F16L11/12; F16L57/00; F16L57/04; F16L9/00; F16L9/14; F16L9/147; Y; Y10; Y10S; Y10S138/00; Y10S138/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A method for making a fire-retardant conduit comprising the steps of: providing a plurality of first cloth members made from carbon fibers and preimpregnated with a binder; applying each of the plurality of first members in sequence about a conduit wall to provide a first fire-retardant barrier portion; providing at least one of a second cloth member made from glass fibers and preimpregnated with a binder; applying the glass fiber member about the first member to provide a second fire-retardant barrier portion; applying a film of release material over the second portion; applying over the release film a shrinkable plastic material having the capability of contracting upon the application of heat; applying heat to the shrinkable material sufficient to cause it to contract and to press the first and second barrier portions toward the conduit wall and into contact with each other; and then curing the binder impregnated in the members.
Claim 2
Independent Claim
151 words
A method for making a fire-retardant conduit comprising the steps of: providing a plurality of first cloth members made from carbon fibers and preimpregnated with a binder; applying each of the plurality of first members in sequence about a conduit wall to provide a first fire-retardant barrier portion; providing at least one of a second cloth member made from glass fibers and preimpregnated with a binder; applying the glass fiber member about the first member to provide a second fire-retardant barrier portion; applying a film of release material over the second portion; applying over the release film a shrinkable plastic material having the capability of contracting upon the application of heat; applying heat to the shrinkable material sufficient to cause it to contract and to press the first and second barrier portions toward the conduit wall and into contact with each other; and then curing the binder impregnated in the members.
Claim 3
Dependent Claim
40 words
The method of claim 1 in which: the first and the second cloth members are woven cloth strips; and the cloth strips are applied by spiral wrapping of the strips, each strip in an alternating direction from the previous strip.
Claim 4
Dependent Claim
38 words
The method of claim 1 in which: the first cloth members are knitted in the form of sleeves; and, the sleeves are applied by slipping, in sequence, each of the plurality of the sleeves about the conduit wall.
References Cited (Backward Citations)
US2653887A
Cited
US2760549A
Cited
US3206344A
Cited
US3295559A
Cited
US3573123A
Cited
US3812885A
Cited
US3883384A
Cited
US3691000A
Cited
US3830261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |