Patent US4724105A successfully refreshed from Google Patents.
US4724105A
Expired / Lapsed
US
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Apparatus for cutting pipe and method pertaining thereto
Assignee: Ensign Bickford Co
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Filing: 1982-07-15
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Granted: 1988-02-09
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Expires: 2002-07-15
Abstract
Abstract The invention pertains to an improved annular shaped charge of a type to be used in the shaped charge carrier of pipe cutting or severing apparatus. The improved annular shaped charge is made up of eight or more shaped charge segments disposed in side to side abutting relation. Each shaped charge segment has a die formed metal band and charge load. The invention also pertains to methods of making said annular shaped charge and the shaped charge segments, which methods are described.
Inventors
- 👤 Harrold D. Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:08
CPC Classifications
B; B26; B26F; B26F3/00; B26F3/04; E; E21; E21B; E21B29/00; E21B29/02; E21B43/00; E21B43/11; E21B43/116; E21B43/117; F; F42; F42B; F42B3/00; F42B3/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
The method of making a shaped charge segment for an annular shaped charge that is to be used in pipe cutting or severing apparatus, comprising the steps of: a. forming a strip of sheet metal material of suitable length into a band; b. filling said band and pressing within same a charge load; c. die forming said filled band into a shaped charge segment having predetermined peripheral shape.
Claim 2
Independent Claim
68 words
The method of making a shaped charge segment for an annular shaped charge that is to be used in pipe cutting or severing apparatus, comprising the steps of: a. forming a strip of sheet metal material of suitable length into a band; b. filling said band and pressing within same a charge load; c. die forming said filled band into a shaped charge segment having predetermined peripheral shape.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the side faces of said shaped charge segment are tapered by the die forming step so as to subtend a predetermined angle.
Claim 4
Dependent Claim
28 words
The method of claim 1 wherein the side faces of said shaped charge segment are tapered by milling after die forming so as to subtend a predetermined angle.
Claim 5
Independent Claim
122 words
The method of making an annular shaped charge for use in pipe cutting or severing apparatus, comprising the steps of: a. forming a strip of sheet metal material of suitable length into a band; b. filling said band and pressing within same a charge load; c. die forming said filled band into a shaped charge segment having predetermined peripheral shape; d. tapering the side faces of said shaped charge segment to subtend a predetermined angle which is substantially equal to 360° divided by the number of shaped charge segments to be used to make up said annular shaped charge; e. assembling the requisite number of said shaped charge segments in side to side abutting relation to make up said annular shaped charge.
Claim 6
Independent Claim
122 words
The method of making an annular shaped charge for use in pipe cutting or severing apparatus, comprising the steps of: a. forming a strip of sheet metal material of suitable length into a band; b. filling said band and pressing within same a charge load; c. die forming said filled band into a shaped charge segment having predetermined peripheral shape; d. tapering the side faces of said shaped charge segment to subtend a predetermined angle which is substantially equal to 360° divided by the number of shaped charge segments to be used to make up said annular shaped charge; e. assembling the requisite number of said shaped charge segments in side to side abutting relation to make up said annular shaped charge.
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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) | 1991-02-08 | 1991-08-10 | 1992-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-08 | 1995-08-10 | 1996-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-08 | 1999-08-10 | 2000-02-09 | $7700.00 | Window Closed / Lapsed |