Patent US3217651A successfully refreshed from Google Patents.
US3217651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple propellent grain for rocket motors
Assignee: Individual
•
Filing: 1963-11-13
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Granted: 1965-11-16
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Expires: 1983-11-13
Abstract
No abstract record available.
Inventors
- 👤 James V Braun
- 👤 Willard S Bacon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:09
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/10; F02K9/12; C; C06; C06B; C06B45/00; C06B45/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A GENERALLY CYLINDRICAL END BURNING PROPELLENT GRAIN HAVING A FLAT CIRCULAR BASE AT ONE END AND A SEMISPHERICAL PORTION AT THE OTHER END, SAID PROPELLENT COMPRISING TWO CHARGES, ONE OF SAID CHARGES HAVING A FAST AND THE OTHER OF SAID CHARGES HAVING A SLOWER-BURNING RATE, A FIRST CONICAL SLOWER-BURNING CHARGE POSITIONED ALONG THE LONGITUDINAL AXIS OF THE CYLINDRICAL PROPELLENT GRAIN, THE APEX OF THE SAID CONICAL PORTION BEING LOCATED IN THE PLANE OF SAID CIRCULAR BASE, THE BASE OF THE CONICAL PORTION BEING INTEGRAL WITH THE SEMISPHERICAL PORTION, AN ANNULAR FASTBURNING CHARGE SURROUNDING AND IN CONTACT WITH THE CONICAL SLOWER-BURNING CHARGE, SAID FAST-BURNING CHARGE HAVING A BASE PORTION LOCATED IN THE PLANE OF THE SAID CIRCULAR BASE; SAID ANNULAR FAST-BURNING CHARGE HAVING WALLS NARROWLY TAPERING FROM SAID BASE AND EXTENDING TO SAID SEMISPHERICAL PORTION, A SECOND-SLOWER BURNING ANNULAR CHARGE SURROUNDING AND IN CONTACT WITH SAID FASTBURNING CHARGE, SAID SECOND SLOWER-BURNING CHARGE HAVING A BASE PORTION LOCATED IN THE PLANE OF THE SAID CIRCULAR BASE AND HAVING A NARROWLY TAPERED WALL EXTENDING TO SAID SEMISPHERICAL PORTION.
Claim 2
Dependent Claim
175 words
A GENERALLY CYLINDRICAL END BURNING PROPELLENT GRAIN HAVING A FLAT CIRCULAR BASE AT ONE END AND A SEMISPHERICAL PORTION AT THE OTHER END, SAID PROPELLENT COMPRISING TWO CHARGES, ONE OF SAID CHARGES HAVING A FAST AND THE OTHER OF SAID CHARGES HAVING A SLOWER-BURNING RATE, A FIRST CONICAL SLOWER-BURNING CHARGE POSITIONED ALONG THE LONGITUDINAL AXIS OF THE CYLINDRICAL PROPELLENT GRAIN, THE APEX OF THE SAID CONICAL PORTION BEING LOCATED IN THE PLANE OF SAID CIRCULAR BASE, THE BASE OF THE CONICAL PORTION BEING INTEGRAL WITH THE SEMISPHERICAL PORTION, AN ANNULAR FASTBURNING CHARGE SURROUNDING AND IN CONTACT WITH THE CONICAL SLOWER-BURNING CHARGE, SAID FAST-BURNING CHARGE HAVING A BASE PORTION LOCATED IN THE PLANE OF THE SAID CIRCULAR BASE; SAID ANNULAR FAST-BURNING CHARGE HAVING WALLS NARROWLY TAPERING FROM SAID BASE AND EXTENDING TO SAID SEMISPHERICAL PORTION, A SECOND-SLOWER BURNING ANNULAR CHARGE SURROUNDING AND IN CONTACT WITH SAID FASTBURNING CHARGE, SAID SECOND SLOWER-BURNING CHARGE HAVING A BASE PORTION LOCATED IN THE PLANE OF THE SAID CIRCULAR BASE AND HAVING A NARROWLY TAPERED WALL EXTENDING TO SAID SEMISPHERICAL PORTION.
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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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |