US2920443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rocket propellant grain with helically grooved perforation
Assignee: Individual
•
Filing: 1955-05-25
•
Granted: 1960-01-12
•
Expires: 1975-05-25
Abstract
No abstract record available.
Inventors
- 👤 Higginson John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:06
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/10; F02K9/18; F05; F05D; F05D2250/00; F05D2250/10; F05D2250/19; F05D2250/191; F05D2250/20; F05D2250/25; Y; Y10; Y10S; Y10S425/00; Y10S425/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US660568A
Cited
US826293A
Cited
US2114214A
Cited
US2628561A
Cited
US2541334A
Cited
US2516898A
Cited
US2661692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |