US3874293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuses and cords
Assignee: AE and Ci Ltd
•
Filing: 1973-05-10
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Granted: 1975-04-01
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Expires: 1993-05-10
Abstract
Abstract Fuses and cords having cores consisting of more than one semifuse. The fuses and cords are of circular cross-section, so that standard size detonator tubes can be used to make, for example, capped fuse. It is expected that the multi-core fuses and cords have better burning characteristics.
Inventors
- 👤 Peter Charles Seligmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:11
CPC Classifications
C; C06; C06C; C06C5/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A plural core non-detonating incendiary fuse for use in initiating explosives, said fuse having at least two contacting parallel lengths of semi-fuse, the cross-section of the lengths of semi-fuse when added together forming a substantially circular cross-section, each of said contacting parallel lengths of semifuse having a core of incendiary composition, said semi-fuses being enclosed within an outer casing thereby forming a plural core incendiary fuse of circular cross-section.
Claim 2
Dependent Claim
69 words
A plural core non-detonating incendiary fuse for use in initiating explosives, said fuse having at least two contacting parallel lengths of semi-fuse, the cross-section of the lengths of semi-fuse when added together forming a substantially circular cross-section, each of said contacting parallel lengths of semifuse having a core of incendiary composition, said semi-fuses being enclosed within an outer casing thereby forming a plural core incendiary fuse of circular cross-section.
Claim 3
Dependent Claim
28 words
A fuse as claimed in claim 1 wherein the semi-fuse has a charge of incendiary composition which is less than the charge used in a single core fuse.
Claim 4
Dependent Claim
28 words
A fuse as claimed in claim 1 wherein the total charge of the semi-fuses of the core is more than the charge used in a single core fuse.
Claim 5
Dependent Claim
19 words
A fuse as claimed in claim 1 wherein any voids between the lengths of semi-fuse are filled with yarns.
Claim 6
Dependent Claim
18 words
A fuse as claimed in claim 1 wherein the outer casing contains at least one moisture impermeable material.
Claim 7
Dependent Claim
21 words
A fuse as claimed in claim 5 wherein the moisture impermeable material is selected from bitumen, rubber and synthetic plastics material.
Claim 8
Dependent Claim
21 words
A fuse as claimed in claim 1 wherein the outer casing consists of more than one layer of a coating material.
Claim 9
Dependent Claim
15 words
A fuse as claimed in claim 1 adapted for use with standard size detonator tubes.
References Cited (Backward Citations)
US2113004A
Cited
US2239052A
Cited
US2498050A
Cited
US2877708A
Cited
US3041914A
Cited
US3320883A
Cited
US3367266A
Cited
US3590739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |