Patent US3397539A successfully refreshed from Google Patents.
US3397539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid fuel rocket with separate firing rate charge portions
Assignee: Bolkow GmbH
•
Filing: 1966-03-10
•
Granted: 1968-08-20
•
Expires: 1986-03-10
Abstract
No abstract record available.
Inventors
- 👤 Schubert Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:58
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/10; F02K9/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2733568A
Cited
US2544422A
Cited
US2748702A
Cited
US3052092A
Cited
US2956401A
Cited
US3128600A
Cited
DE1154978B
Cited
US3293855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |