US3212439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blasting caps containing only secondary explosive
Assignee: Services Petroliers Schlumberger SA
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Filing: 1962-11-21
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Granted: 1965-10-19
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Expires: 1982-11-21
Abstract
No abstract record available.
Inventors
- 👤 Reyne Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:50
CPC Classifications
F; F42; F42C; F42C19/00; F42C19/08; F42C19/12; F42B; F42B3/00; F42B3/10; F42B3/12; F42B3/124; F42B3/125; F42B3/195
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A BLASTING CAP FOR USE WITH OIL WELL PERFORATORS CONSISTINF OF: A HOLLOW STEEL TUBE WITH A WALL THICKNESS OF AT LEAST THRE MILLIMETERS, AN INNER DIAMETER DIMENSION OF EIGHT MILLIMETERS AND A LENGTH DIMENSION OF THRITY-SEVEN MILLIMETERS, SAID DIAMETER AND LENGTH DIMENSIONS BEING HELD TO AN ACCUARACY OF TEN PERCENT, SAID TUBE BEING SUBSTANTIALLY FILLED WITH A SECONDARY EXPLOSIVE HAVING A REACTION ZONE OF LESS THAN THREE MILLIMETERS A CLOSURE FOR ONE END OF SAID TUBE INCLUDING AN ELECTRICAL IGNITER AND A CLOSURE FOR THE OTHER END OF SAID TUBE INCLUDING A THIN WALL PORTION FOR TRANSMITTING A DETONATION WAVE THEREFROM.
Claim 2
Dependent Claim
102 words
A BLASTING CAP FOR USE WITH OIL WELL PERFORATORS CONSISTINF OF: A HOLLOW STEEL TUBE WITH A WALL THICKNESS OF AT LEAST THRE MILLIMETERS, AN INNER DIAMETER DIMENSION OF EIGHT MILLIMETERS AND A LENGTH DIMENSION OF THRITY-SEVEN MILLIMETERS, SAID DIAMETER AND LENGTH DIMENSIONS BEING HELD TO AN ACCUARACY OF TEN PERCENT, SAID TUBE BEING SUBSTANTIALLY FILLED WITH A SECONDARY EXPLOSIVE HAVING A REACTION ZONE OF LESS THAN THREE MILLIMETERS A CLOSURE FOR ONE END OF SAID TUBE INCLUDING AN ELECTRICAL IGNITER AND A CLOSURE FOR THE OTHER END OF SAID TUBE INCLUDING A THIN WALL PORTION FOR TRANSMITTING A DETONATION WAVE THEREFROM.
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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |