Patent US3358780A successfully refreshed from Google Patents.
US3358780A
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Cumulative shaped charges
Assignee: Dresser Industries Inc
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Filing: 1965-05-24
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Granted: 1967-12-19
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Expires: 1985-05-24
Abstract
No abstract record available.
Inventors
- 👤 A A Venghiattis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:57
CPC Classifications
F; F42; F42B; F42B12/00; F42B12/02; F42B12/04; F42B12/10; F42B12/16; F42B12/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
129 words
A SHAPED CHARGE UNIT FOR PERFORATING A WELL CASING COMPRISING: A PAIR OF SHAPED CHARGES; A CARRIER FOR SAID SHAPED CHARGES, SAID CARRIER COAXIALLY ALIGNING SAID SHAPED CHARGES; MEANS MAINTAINING THE SHAPED CHARGES IN SPACED RELATION IN SAID CARRIER; MEANS FOR DETONATING SAID SHAPED CHARGES FORMED OF A COMMON BOOSTER AND TWO PIECES OF PRINACORD, ONE PIECE OF PRIMACORD EXTENDING TO EACH SHAPED CHARGE, THE LENGTH OF EACH PRIMACORD BEING SUCH THAT THE DETONATION OF THE REAR CHARGE IS RETARDED A SUFFICIENT LENGTH OF TIME SO THAT THE JET OF THE REAR CHARGE BEGINS TO FORM AS THE JET OF THE FORWARD CHARGE IS ABOUT TO BE COMPLETED, WHEREBY THE TIP OF THE JET OF THE REAR CHARGE CLOSELY FOLLOWS THE END OF THE JET OF THE FRONT CHARGE.
References Cited (Backward Citations)
FR999974A
Cited
FR1231003A
Cited
FR1002092A
Cited
US2843041A
Cited
US2946283A
Cited
US2984307A
Cited
US3215074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-18 | 1971-06-19 | 1971-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-18 | 1975-06-19 | 1975-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-18 | 1979-06-19 | 1979-12-19 | $7700.00 | Window Closed / Lapsed |