US2737019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable area convergent-divergent diffuser
Assignee: Individual
•
Filing: 1953-08-14
•
Granted: 1956-03-06
•
Expires: 1973-08-14
Abstract
No abstract record available.
Inventors
- 👤 Louis S Billman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:54
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/06; F02K1/10; F02C; F02C7/00; F02C7/04; F02C7/042; F05; F05D; F05D2250/00; F05D2250/30; F05D2250/32; F05D2250/323; F05D2250/324
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2632295A
Cited
US2648195A
Cited
US2596435A
Cited
US2590215A
Cited
US2570129A
Cited
US2638738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-06 | 1959-09-05 | 1960-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-06 | 1963-09-05 | 1964-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-06 | 1967-09-05 | 1968-03-06 | $7700.00 | Window Closed / Lapsed |