US2988152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor blade
Assignee: Individual
•
Filing: 1958-12-03
•
Granted: 1961-06-13
•
Expires: 1978-12-03
Abstract
No abstract record available.
Inventors
- 👤 Edward F Katzenberger
- 👤 Lewis G Knapp
- 👤 John E A Steinback
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:22
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49826; Y10T29/49879
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB353908A
Cited
US2412908A
Cited
US2362301A
Cited
US2469480A
Cited
US2485502A
Cited
US2486710A
Cited
US2667226A
Cited
US2631676A
Cited
US2769647A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |