US4036138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid waterproof container for slurried explosives in small diameters
Assignee: Indian Explosives Ltd
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Filing: 1975-12-17
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Granted: 1977-07-19
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Expires: 1995-12-17
Abstract
Abstract The present invention relates to a waterproof and rigid container for slurried explosives which comprises a tube or shell formed by superimposing partially or wholly a shrinkable film on paper and rolling the film and paper into the shape of a tube or shell of continuous and successive layers of the film and paper, the inner layer being the film and the outer layer being the paper, and thereafter crimping the tube or shell to one end, the tube or shell so formed being externally coated with a suitable waterproofing medium under predetermined conditions thereby causing a partial shrinkage of the film and, when required, the waterproofed tube or shell is filled with an explosive and the filling or mouth end is crimped and waterproofed forming a rigid and waterproof cartridge.
Inventors
- 👤 Gopal Mohan Chopra
- 👤 Tyagaraja Gangadharan
- 👤 Ram Narain Sinha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:03
CPC Classifications
F; F42; F42B; F42B3/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
126 words
A waterproof and rigid container for slurried explosives which comprises a tube or shell formed by superimposing partially or wholly a shrinkable film on paper and rolling the film and paper into the shape of a tube or shell of continuous and successive layers of the film and paper, the inner layer being the film and the outer layer being the paper, and thereafter crimping the tube or shell at one end, the tube or shell so formed being externally coated with a suitable waterproofing medium under predetermined conditions thereby causing a partial shrinkage of the film and, when required, the waterproofed tube or shell is filled with an explosive and the filling or mouth end is crimped and waterproofed forming a rigid and waterproof cartridge.
Claim 2
Dependent Claim
126 words
A waterproof and rigid container for slurried explosives which comprises a tube or shell formed by superimposing partially or wholly a shrinkable film on paper and rolling the film and paper into the shape of a tube or shell of continuous and successive layers of the film and paper, the inner layer being the film and the outer layer being the paper, and thereafter crimping the tube or shell at one end, the tube or shell so formed being externally coated with a suitable waterproofing medium under predetermined conditions thereby causing a partial shrinkage of the film and, when required, the waterproofed tube or shell is filled with an explosive and the filling or mouth end is crimped and waterproofed forming a rigid and waterproof cartridge.
Claim 3
Dependent Claim
17 words
A container as claimed in claim 1 wherein the film and paper are of the same dimensions.
Claim 4
Dependent Claim
21 words
A container as claimed in claim 1 wherein the width of the film is greater than the width of the paper.
Claim 5
Dependent Claim
35 words
A container as claimed in claim 3 wherein the width of the film is greater at the mouth end of the tube or shell, the film extending beyond the paper is folded over the latter.
Claim 6
Dependent Claim
12 words
A container as claimed in claim 1 wherein the paper is laminated.
Claim 7
Dependent Claim
34 words
A container as claimed in claim 5 wherein a thin strip of film is used along the length of the paper at the closed end and/or the mouth end of the tube or shell.
Claim 8
Dependent Claim
32 words
A container as claimed in claim 6 wherein the film is greater at the mouth end of the tube or shell, the film extending beyond the paper is folded over the latter.
Claim 9
Dependent Claim
16 words
A container as claimed in claim 1 wherein the waterproofing medium consists of wax and rosin.
References Cited (Backward Citations)
US2408189A
Cited
US3402874A
Cited
US3200743A
Cited
US3321886A
Cited
US3731625A
Cited
US3837279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |