Patent US4206706A successfully refreshed from Google Patents.
US4206706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joining lengths of detonating fuse-cord
Assignee: Imperial Chemical Industries Ltd
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Filing: 1975-04-14
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Granted: 1980-06-10
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Expires: 1995-04-14
Abstract
Abstract A method of joining detonating cord lengths by encapsulation of the cord lengths in heat-shrunk synthetic plastics film. The method is useful in splicing detonating cord ends and assembling multi-strand charges.
Inventors
- 👤 Daniel Steele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:53
CPC Classifications
C; C06; C06C; C06C5/00; C06C5/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
62 words
A method of joining two or more lengths of flexible detonating fuse-cord having an explosive core enclosed within a yieldable water-proof envelope, said method comprising placing the ends of the lengths in parallel contact, surrounding the contacting lengths with a heat-shrinkable sleeve of synthetic plastics film, and heating the sleeve to cause it to shrink and bind the lengths of fuse-cord together.
Claim 2
Independent Claim
62 words
A method of joining two or more lengths of flexible detonating fuse-cord having an explosive core enclosed within a yieldable water-proof envelope, said method comprising placing the ends of the lengths in parallel contact, surrounding the contacting lengths with a heat-shrinkable sleeve of synthetic plastics film, and heating the sleeve to cause it to shrink and bind the lengths of fuse-cord together.
Claim 3
Dependent Claim
36 words
A method as claimed in claim 1 wherein the explosive core at least at one of the ends of the fuse-cord is covered with a waterproof closure comprising a heat-shrunk end cap of synthetic plastics film.
Claim 4
Dependent Claim
22 words
A method as claimed in claim 2 wherein the heat-shrinking of the end cap and of the splicing sleeve is effected simultaneously.
Claim 5
Dependent Claim
36 words
A method as claimed in claim 1 wherein the heat-shrinkable film is selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, copolymers of any two or more thereof, and copolymers of ethylene and vinyl acetate.
Claim 6
Dependent Claim
29 words
A method as claimed in claim 1 wherein the film is shrunk by heating with a heating medium selected from the group consisting of hot gas and hot liquid.
Claim 7
Dependent Claim
31 words
A method as claimed in claim 5 wherein the film is shrunk by means of a heating medium selected from the group consisting of hot water, mineral oil and silicone oil.
Claim 8
Dependent Claim
35 words
An assembly of two or more lengths of detonating fuse-cord having an explosive core enclosed within a yieldable water-proof envelope, said lengths being in parallel contact and being bound together by heat-shrunk synthetic plastics film.
Claim 9
Dependent Claim
35 words
An assembly of two or more lengths of detonating fuse-cord having an explosive core enclosed within a yieldable water-proof envelope, said lengths being in parallel contact and being bound together by heat-shrunk synthetic plastics film.
Claim 10
Dependent Claim
36 words
A length of detonating fuse-cord having an explosive core enclosed within a yieldable water-proof envelope, said length containing a splice wherein overlapping parallel portions of a detonating cord are bound together by heat-shrunk synthetic plastics film.
Claim 11
Dependent Claim
36 words
A length of detonating fuse-cord having an explosive core enclosed within a yieldable water-proof envelope, said length containing a splice wherein overlapping parallel portions of a detonating cord are bound together by heat-shrunk synthetic plastics film.
Claim 12
Dependent Claim
40 words
An elongated explosive charge comprising two or more parallel strands of detonating fuse-cord having an explosive core enclosed within a yieldable water-proof envelope, said strands being in parallel contact and being encapsulated within a heat-shrunk casing of synthetic plastics film.
Claim 13
Dependent Claim
40 words
An elongated explosive charge comprising two or more parallel strands of detonating fuse-cord having an explosive core enclosed within a yieldable water-proof envelope, said strands being in parallel contact and being encapsulated within a heat-shrunk casing of synthetic plastics film.
Claim 14
Dependent Claim
37 words
An assembly as claimed in claim 7 wherein the synthetic plastics film is selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, copolymers of any two or more thereof, and copolymers of ethylene and vinyl acetate.
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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) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |