Patent US4280407A successfully refreshed from Google Patents.
US4280407A
Expired / Lapsed
US
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Explosive package assembly
Assignee: Orica Explosives Technology Pty Ltd
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Filing: 1979-05-21
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Granted: 1981-07-28
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Expires: 1999-05-21
Abstract
Abstract An explosive package is provided which is particularly adapted to be placed against and around the inside and outside curvature of a metal pipe for explosive welding purposes. The package is a substantially flat trapezoidal-shaped container, the shorter, non-parallel ends of which can be adjustably abutted against the non-parallel ends of a similar package in order to provide a continuous ring or band of explosives inside or outside the circumference of a pipe.
Inventors
- 👤 John R. Allen
- 👤 Louis-Georges Desrochers
- 👤 Alain Loyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:01
CPC Classifications
F; F42; F42B; F42B3/00; B; B23; B23K; B23K20/00; B23K20/06; B23K20/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
A metal welding explosive charge in the form of a package adapted for placement against the inner curved surface of a hollow metal cylinder comprising: (a) a generally flexible, hollow, substantially flat, elongated, box-like container having in one dimension parallel side edges of unequal length and in a second dimension non-parallel side edges of equal length, the container thus describing a trapezoidal shape in plan with parallel side edges and non-parallel end edges, and (b) a deformable explosive composition contained therein, the said container being fittable in abutting end contact with a like container along a non-parallel side edge, the said abutted container forming a continuous, length-adjusted closed ring assembly of packages against a curved metal surface to be explosively welded.
Claim 2
Dependent Claim
121 words
A metal welding explosive charge in the form of a package adapted for placement against the inner curved surface of a hollow metal cylinder comprising: (a) a generally flexible, hollow, substantially flat, elongated, box-like container having in one dimension parallel side edges of unequal length and in a second dimension non-parallel side edges of equal length, the container thus describing a trapezoidal shape in plan with parallel side edges and non-parallel end edges, and (b) a deformable explosive composition contained therein, the said container being fittable in abutting end contact with a like container along a non-parallel side edge, the said abutted container forming a continuous, length-adjusted closed ring assembly of packages against a curved metal surface to be explosively welded.
Claim 3
Dependent Claim
17 words
An explosive package as claimed in claim 1 having a sealable filling aperture in one edge thereof.
Claim 4
Dependent Claim
20 words
An explosive package as claimed in claim 1 having a tapered or stepped thick-to-thin cross-section between its parallel side edges.
Claim 5
Dependent Claim
41 words
An explosive package as claimed in claim 3 having a projection along its thicker side edge, said projection being adapted to retain said package in line with the leading edge of a metal section against which the package is in contact.
Claim 6
Dependent Claim
30 words
An explosive package as claimed in claim 3 having means along its thicker side edge adapted to retain along and in contact with said side edge, a cord-like initiating means.
Claim 7
Dependent Claim
28 words
An explosive package as claimed in claim 1 wherein the material of the container is selected from the group consisting of plastic film, metal foil and blow-molded plastic.
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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) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |