US3897731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time delay fuse
Assignee: Catalyst Research Corp
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Filing: 1961-10-30
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Granted: 1975-08-05
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Expires: 1981-10-30
Abstract
Abstract 1. A time delay fuse comprising a consolidated body of noncombustible insulating fibers having enclosed therein a winding fuse path having two ends consisting of a portion of said noncombustible insulating fibers coated with a combustible composition which evolves substantially no gas on burning, said fuse path being defined and spaced from itself by said uncoated fibers, said ends of the fuse path being exposed on the surface of the consolidated body.
Inventors
- 👤 Donald E Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:49
CPC Classifications
F; F42; F42C; F42C9/00; F42C9/10; C; C06; C06C; C06C5/00; C06C5/06; C06C7/00; C06C7/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
A time delay fuse comprising a consolidated body of noncombustible insulating fibers having enclosed therein a winding fuse path having two ends consisting of a portion of said non-combustible insulating fibers coated with a combustible composition which evolves substantially no gas on burning, said fuse path being defined and spaced from itself by said uncoated fibers, said ends of the fuse path being exposed on the surface of the consolidated body.
Claim 2
Dependent Claim
71 words
A time delay fuse comprising a consolidated body of noncombustible insulating fibers having enclosed therein a winding fuse path having two ends consisting of a portion of said non-combustible insulating fibers coated with a combustible composition which evolves substantially no gas on burning, said fuse path being defined and spaced from itself by said uncoated fibers, said ends of the fuse path being exposed on the surface of the consolidated body.
Claim 3
Dependent Claim
15 words
A time delay fuse according to claim 1 in which the fibers are glass fibers.
Claim 4
Dependent Claim
96 words
A time delay fuse comprising a cylindrical consolidated body of non-combustible insulating fibers having therein: (1) an enclosed spiral fuse path on a plane normal to the axis of said cylindrical body and consisting of a portion of said non-combustible insulating fibers coated with a combustible composition which evolves substantially no gas on burning, (2) ignitable means in said cylindrical body having an exposed surface and connected to one end of said fuse path, and (3) primer means in said cylindrical body having an exposed surface and connected to the opposite end of said fuse strip.
Claim 5
Dependent Claim
96 words
A time delay fuse comprising a cylindrical consolidated body of non-combustible insulating fibers having therein: (1) an enclosed spiral fuse path on a plane normal to the axis of said cylindrical body and consisting of a portion of said non-combustible insulating fibers coated with a combustible composition which evolves substantially no gas on burning, (2) ignitable means in said cylindrical body having an exposed surface and connected to one end of said fuse path, and (3) primer means in said cylindrical body having an exposed surface and connected to the opposite end of said fuse strip.
Claim 6
Dependent Claim
15 words
A time delay fuse according to claim 3 in which the fibers are glass fibers.
Claim 7
Dependent Claim
134 words
A time delay fuse comprising a consolidated body of noncombustible insulating fibers having therein a first ignitable disc having an exposed surface consisting of a portion of said fibers coated with combustible material which evolves substantially no gas on burning, a second ignitable disc having an exposed surface and spaced from said first ignitable disc consisting of a portion of said fibers coated with a combustible material which evolves substantially no gas on burning, and an enclosed winding fuse path consisting of a portion of said fibers coated with a combustible composition which evolves substantially no gas on burning, said fuse path being defined and spaced from itself by said uncoated fibers, one end of said fuse path contacting said first disc and the opposite end of said fuse path contacting said second disc.
Claim 8
Dependent Claim
134 words
A time delay fuse comprising a consolidated body of noncombustible insulating fibers having therein a first ignitable disc having an exposed surface consisting of a portion of said fibers coated with combustible material which evolves substantially no gas on burning, a second ignitable disc having an exposed surface and spaced from said first ignitable disc consisting of a portion of said fibers coated with a combustible material which evolves substantially no gas on burning, and an enclosed winding fuse path consisting of a portion of said fibers coated with a combustible composition which evolves substantially no gas on burning, said fuse path being defined and spaced from itself by said uncoated fibers, one end of said fuse path contacting said first disc and the opposite end of said fuse path contacting said second disc.
Claim 9
Dependent Claim
23 words
A time delay fuse according to claim 5 in which the ignitable discs are fast burning and the fuse path is slow burning.
Claim 10
Dependent Claim
147 words
A time delay fuse comprising a cylindrical consolidated body of non-combustible fibers having top and bottom surfaces and having therein a combustible path consisting of a portion of said fibers coated with a combustible material that evolves substantially no gas on burning, said combustible path consisting of (1) a first ignitable disc normal to and on the axis of said body and having an exposed surface on said top face; (2) a second ignitable disc spaced from said first disc and having an exposed surface on the said bottom face, said second disc being normal to and on the axis of said body; (3) an enclosed fuse path comprising a spiral on a plane normal to the axis of said body and between said discs, one end of said fuse path contacting said first disc and the other end of said fuse path contacting said second disc.
Claim 11
Dependent Claim
147 words
A time delay fuse comprising a cylindrical consolidated body of non-combustible fibers having top and bottom surfaces and having therein a combustible path consisting of a portion of said fibers coated with a combustible material that evolves substantially no gas on burning, said combustible path consisting of (1) a first ignitable disc normal to and on the axis of said body and having an exposed surface on said top face; (2) a second ignitable disc spaced from said first disc and having an exposed surface on the said bottom face, said second disc being normal to and on the axis of said body; (3) an enclosed fuse path comprising a spiral on a plane normal to the axis of said body and between said discs, one end of said fuse path contacting said first disc and the other end of said fuse path contacting said second disc.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |