US3417699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact fuze
Assignee: United States Department of the Army
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Filing: 1956-05-28
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Granted: 1968-12-24
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Expires: 1976-05-28
Abstract
No abstract record available.
Inventors
- 👤 William M Piper
- 👤 Rabinow Jacob
- 👤 Ralph B Rizer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:37
CPC Classifications
F; F42; F42C; F42C11/00; F42C11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
IN AN ORDNANCE PROJECTILE HAVING AN EXPLOSIVE CHARGE, IMPROVED MEANS FOR DETONATING SAID EXPLOSIVE CHARGE IN RESPONSE TO IMPACT OF SAID PROJECTILE, SAID IMPROVED MEANS COMPRISING IN COMBINATION: A PROJECTILE CASE HAVING A PLANE-SURFACED ANNULAR STEP THEREIN LOCATED NEAR THE BASE OF SAID PROJECTILE, A RING-SHAPED PIEZOELECTRIC DETECTING ELEMENT DISPOSED IN SAID STEP SO AS TO INTERCEPT THE SHOCKWAVES GENERATED IN SAID CASE UPON IMPACT, SAID PIEZOELECTRIC DETECTING ELEMENT COMPRISING TWO WASHERS OF PIEZOELECTRIC MATERIAL AND AN ELECTRICALLY CONDUCTIVE WASHER THEREBETWEEN, SAID WASHERS BEING CONCENTRIC AND SNUGLY FITTED IN SAID STEP, ONE SIDE OF EACH PIEZOELECTRIC WASHER BEING IN CONTACT WITH A SIDE OF SAID CONDUCTIVE WASHER AND THE OTHER SIDES OF SAID PIEZOELECTRIC WASHERS BEING IN CONTACT WITH SAID CASE AT OPPOSITE SIDES OF SAID STEP, MEANS INSULATING SAID OCNDUCTIVE WASHER FROM SAID CASE, DETONATOR MEANS WITHIN SAID CASE ADAPTED TO DETONATE SAID EXPLOSIVE CHARGE IN RESPONSE TO THE ELECTRICAL PULSE GENERATED BETWEEN SAID CONDUCTIVE WASHER AND SAID CASE UPON IMPACT OF SAID PROJECTILE, AND MEANS CONNECTING SAID DETONATOR MEANS TO SAID CONDUCTIVE WASHER TO TRANSFER SAID ELECTRICAL PULSE THEREBETWEEN.
Claim 2
Dependent Claim
181 words
IN AN ORDNANCE PROJECTILE HAVING AN EXPLOSIVE CHARGE, IMPROVED MEANS FOR DETONATING SAID EXPLOSIVE CHARGE IN RESPONSE TO IMPACT OF SAID PROJECTILE, SAID IMPROVED MEANS COMPRISING IN COMBINATION: A PROJECTILE CASE HAVING A PLANE-SURFACED ANNULAR STEP THEREIN LOCATED NEAR THE BASE OF SAID PROJECTILE, A RING-SHAPED PIEZOELECTRIC DETECTING ELEMENT DISPOSED IN SAID STEP SO AS TO INTERCEPT THE SHOCKWAVES GENERATED IN SAID CASE UPON IMPACT, SAID PIEZOELECTRIC DETECTING ELEMENT COMPRISING TWO WASHERS OF PIEZOELECTRIC MATERIAL AND AN ELECTRICALLY CONDUCTIVE WASHER THEREBETWEEN, SAID WASHERS BEING CONCENTRIC AND SNUGLY FITTED IN SAID STEP, ONE SIDE OF EACH PIEZOELECTRIC WASHER BEING IN CONTACT WITH A SIDE OF SAID CONDUCTIVE WASHER AND THE OTHER SIDES OF SAID PIEZOELECTRIC WASHERS BEING IN CONTACT WITH SAID CASE AT OPPOSITE SIDES OF SAID STEP, MEANS INSULATING SAID OCNDUCTIVE WASHER FROM SAID CASE, DETONATOR MEANS WITHIN SAID CASE ADAPTED TO DETONATE SAID EXPLOSIVE CHARGE IN RESPONSE TO THE ELECTRICAL PULSE GENERATED BETWEEN SAID CONDUCTIVE WASHER AND SAID CASE UPON IMPACT OF SAID PROJECTILE, AND MEANS CONNECTING SAID DETONATOR MEANS TO SAID CONDUCTIVE WASHER TO TRANSFER SAID ELECTRICAL PULSE THEREBETWEEN.
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) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |