US2977884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propellant grain restriction
Assignee: —
•
Filing: —
•
Granted: 1961-04-04
•
Expires: 1978-04-04
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:29
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/12; C09; C09D; C09D167/00; C09D167/06; F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1809984A
Cited
US2229208A
Cited
US2429688A
Cited
US2443736A
Cited
US2443739A
Cited
US2443740A
Cited
US2539404A
Cited
US2528235A
Cited
US2485294A
Cited
US2479828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |