Patent US3208380A successfully refreshed from Google Patents.
US3208380A
Expired / Lapsed
US
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Electric blasting cap assembly
Assignee: Hercules Powder Co
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Filing: 1965-01-19
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Granted: 1965-09-28
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Expires: 1985-01-19
Abstract
No abstract record available.
Inventors
- 👤 George H Scherrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:53
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/12; F42B3/124; F42B3/128
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
AN ELECTRIC BLASTING CAP ASSEMBLY COMPRISING A CLOSED SHELL; A PAIR OF ELECTRICAL CONDUCTOR WIRES EXTENDING INTO SAID SHELL AND TERMINATING THEREIN; A BRIDGEWIRE WITHIN SAID SHELL CONNECTING THE TERMINAL ENDS OF SAID CONDUCTOR WIRES AND DETONATABLE IN RESPONSE TO PASSAGE OF A HIGH ENERGY ELECTRIC CURRENT THERETHROUGH WHEN IN AN AMOUNT OF FROM 10**2 TO 10**4 TIMES GREATER THAN THAT REQUIRED FOR MELTING THE BRIDGEWIRE; AND PENTAERYTHRITOL TETRANITRATE, HAVING A DENSITY OF FROM 0.86 TO 1.04 GRAMS/CC., WITHIN SAID SHELL, IN DIRECT CONTACT WITH SAID BRIDGEWIRE.
Claim 2
Dependent Claim
87 words
AN ELECTRIC BLASTING CAP ASSEMBLY COMPRISING A CLOSED SHELL; A PAIR OF ELECTRICAL CONDUCTOR WIRES EXTENDING INTO SAID SHELL AND TERMINATING THEREIN; A BRIDGEWIRE WITHIN SAID SHELL CONNECTING THE TERMINAL ENDS OF SAID CONDUCTOR WIRES AND DETONATABLE IN RESPONSE TO PASSAGE OF A HIGH ENERGY ELECTRIC CURRENT THERETHROUGH WHEN IN AN AMOUNT OF FROM 10**2 TO 10**4 TIMES GREATER THAN THAT REQUIRED FOR MELTING THE BRIDGEWIRE; AND PENTAERYTHRITOL TETRANITRATE, HAVING A DENSITY OF FROM 0.86 TO 1.04 GRAMS/CC., WITHIN SAID SHELL, IN DIRECT CONTACT WITH SAID BRIDGEWIRE.
References Cited (Backward Citations)
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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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |