Patent US1958907A successfully refreshed from Google Patents.
US4493261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced explosive shock tube
Assignee: Orica Explosives Technology Pty Ltd
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Filing: 1983-11-02
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Granted: 1985-01-15
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Expires: 2003-11-02
Abstract
Abstract Low energy explosive shock tubing is provided which consists of a two-ply, inner and outer layer plastic tube having a plurality of lengthwise textile filaments bonded into the interface between the plastic layers. The textile filaments are chosen for their low elongation properties and the resultant shock tube resists stretching especially in warm borehole environments.
Inventors
- 👤 James R. Simon
- 👤 David J. Welburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:15
CPC Classifications
C; C06; C06C; C06C5/00; C06C5/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A low energy explosive shock tube comprising a bonded, two-ply, inner and outer layer plastic tube, the inner layer having high adhesion properties for a thin layer of powdered energy-producing material distributed on its inner surface and the outer layer having high resistance to mechanical damage and a plurality of lengthwise textile filaments of low elongation properties bonded at the interface of the said inner and outer tube layers.
Claim 2
Dependent Claim
69 words
A low energy explosive shock tube comprising a bonded, two-ply, inner and outer layer plastic tube, the inner layer having high adhesion properties for a thin layer of powdered energy-producing material distributed on its inner surface and the outer layer having high resistance to mechanical damage and a plurality of lengthwise textile filaments of low elongation properties bonded at the interface of the said inner and outer tube layers.
Claim 3
Dependent Claim
21 words
An explosive shock tube as claimed in claim 1 wherein the said inner tube layer consists of a salt-containing polyethylene ionomer.
Claim 4
Dependent Claim
26 words
An explosive shock tube as claimed in claim 1 wherein the said outer tube layer plastic is selected from polyethylene, polypropylene, polyvinyl chloride, polyamide and polyurethane.
Claim 5
Dependent Claim
23 words
An explosive shock tube as claimed in claim 1 wherein the said textile filaments are selected from viscose rayon, polyamide, polyester and polytetrafluoroethylene.
Claim 6
Dependent Claim
22 words
An explosive shock tube as claimed in claim 1 wherein the denier of the said textile filaments is from 500 to 2000.
Claim 7
Dependent Claim
24 words
An explosive shock tube as claimed in claim 3 wherein the outer tube layer comprises polyethylene having a density of 0.93 g/cm 3 .
References Cited (Backward Citations)
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Cited
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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) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |