US2885160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circulatory jet airfoils
Assignee: ELIZABETH M GRISWOLD
•
Filing: 1954-06-01
•
Granted: 1959-05-05
•
Expires: 1974-06-01
Abstract
No abstract record available.
Inventors
- 👤 Ii Roger W Griswold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:31
CPC Classifications
B; B64; B64C; B64C3/00; B64C3/10; B64C3/14; B64C3/141; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 0
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US2478793A
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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) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |