US3867884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosive fuse-cord
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1974-01-28
•
Granted: 1975-02-25
•
Expires: 1994-01-28
Abstract
Abstract An explosive fuse-cord having an inner explosive core and an outer waterproofing sheath of a copolymer of ehtylene and from 7 to 30 percent by weight of the copolymer of vinyl acetate or alkyl acrylate or alkyl methacrylate wherein the alkyl group contains from 1 to 4 carbon atoms.
Inventors
- 👤 Michael Anthony Langrish-Smith
- 👤 Daniel Steele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:47
CPC Classifications
C; C06; C06C; C06C5/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
32 words
AN EXPLOSIVE FUSE-CORD COMPRISING AN INNER EXPLOSIVE CORE AND AN OUTER WATERPROOFING SHEATH OF A COPOLYMER OF ETHYLENE AND VINYL ACETATE CONTAINING FROM 7 TO 30 PERCENT BY WEIGHT OF THE LATTER.
Claim 2
Dependent Claim
32 words
AN EXPLOSIVE FUSE-CORD COMPRISING AN INNER EXPLOSIVE CORE AND AN OUTER WATERPROOFING SHEATH OF A COPOLYMER OF ETHYLENE AND VINYL ACETATE CONTAINING FROM 7 TO 30 PERCENT BY WEIGHT OF THE LATTER.
Claim 3
Dependent Claim
21 words
An explosive fuse-cord as claimed in claim 1 wherein the copolymer has a melt flow index of from 0.1 to 25.
Claim 4
Dependent Claim
21 words
An explosive fuse-cord as claimed in claim 1 wherein the copolymer is applied to the fuse-cord as a pressure extruded sheath.
Claim 5
Dependent Claim
27 words
An explosive fuse-cord as claimed in claim 3 wherein the explosive core is PETN and the sheath is extruded at a temperature below the PETN melting point.
Claim 6
Dependent Claim
19 words
An explosive fuse-cord as claimed in claim 1 comprising reinforcing layers of textile wrapping wound around the explosive core.
Claim 7
Dependent Claim
16 words
An explosive fuse-cord as claimed in claim 5 wherein the textile wrappings comprise fibrillated thermoplastics yarn.
Claim 8
Dependent Claim
16 words
An explosive fuse-cord as claimed in claim 6 wherein the fibrillated thermoplastics yarn comprises fibrillated polypropylene.
Claim 9
Dependent Claim
28 words
An explosive fuse-cord as claimed in claim 7 wherein the fibrillated polypropylene yarn is coated with a hot melt adhesive comprising a copolymer of ethylene and vinyl acetate.
Claim 10
Dependent Claim
16 words
An explosive fuse-cord as claimed in claim 1 wherein the copolymer sheath contains finely divided carbon.
Claim 11
Dependent Claim
53 words
An explosive fuse-cord comprising an inner explosive core of meltable material and an outer waterproofing extruded sheath of a copolymer of ethylene and vinyl acetate containing from 7 to 30 percent by weight of the latter, said sheath being extruded around said core at a temperature below the melting point of said core.
Claim 12
Dependent Claim
53 words
An explosive fuse-cord comprising an inner explosive core of meltable material and an outer waterproofing extruded sheath of a copolymer of ethylene and vinyl acetate containing from 7 to 30 percent by weight of the latter, said sheath being extruded around said core at a temperature below the melting point of said core.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |