US3921529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosive cartridge
Assignee: PPG Architectural Coatings Canada Inc
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Filing: 1974-02-01
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Granted: 1975-11-25
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Expires: 1994-02-01
Abstract
Abstract A plastic film wrap for an explosive cartridge is provided which consists of a laminate of at least two films, the inner laminate close to the explosive comprising a stiffened film having longitudinal areas of weakness therein and the outer laminate comprising a resilient thin film. Upon application of pressure to the cartridge, the laminated film will separate at the areas of weakness.
Inventors
- 👤 James Glen Mckee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:17
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/26; B32B3/266; F; F42; F42B; F42B3/00; F42B3/087; B32B1/00; B32B1/08; B32B27/00; B32B27/06; B32B27/32; B32B2307/00; B32B2307/70; B32B2307/726; B32B2307/7265; B32B2597/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A cylindrical explosive cartridge adapted to expand circumferentially upon application of pressue upon an end of the cartridge comprising a substantially rigid thin-wall plastic tube closed at both ends and containing a blasting explosive composition, the said thin-wall tube comprising a laminate of at least two films, the said films being bonded together over substantially all of their areas of contact, the outermost film of the bonded laminate comprising a resilient thin film of thermoplastic material and the contiguous film of the bonded laminate comprising a stiffener film of less resilience than said outer film, the said contiguous stiffener film having longitudinal areas of weakness therein.
Claim 2
Dependent Claim
106 words
A cylindrical explosive cartridge adapted to expand circumferentially upon application of pressue upon an end of the cartridge comprising a substantially rigid thin-wall plastic tube closed at both ends and containing a blasting explosive composition, the said thin-wall tube comprising a laminate of at least two films, the said films being bonded together over substantially all of their areas of contact, the outermost film of the bonded laminate comprising a resilient thin film of thermoplastic material and the contiguous film of the bonded laminate comprising a stiffener film of less resilience than said outer film, the said contiguous stiffener film having longitudinal areas of weakness therein.
Claim 3
Dependent Claim
46 words
An explosive cartridge as claimed in claim 1 wherein the said bonded laminate comprises an inner and outer resilient thin film having a stiffener film therebetween and bonded to each of said inner and outer films, the said stiffener film having longitudinal areas of weakness therein.
Claim 4
Dependent Claim
44 words
An explosive cartridge as claimed in claim 1 wherein the said resilient thin film is a polyethylene film having a thickness of between about 0.75 and 2.0 mils and the said stiffener film is selected from regenerated cellulose, cellulose acetate, polyester, paper and polypropylene.
Claim 5
Dependent Claim
29 words
An explosive cartridge as claimed in claim 1 wherein the areas of weakness in said stiffner film comprise penetrating cuts, lines of perforations or indentations or combinations of these.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |