US2849788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making hollow blades
Assignee: AV Roe Canada Ltd
•
Filing: 1952-08-02
•
Granted: 1958-09-02
•
Expires: 1972-08-02
Abstract
No abstract record available.
Inventors
- 👤 Creek John Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:18
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/02; B21; B21K; B21K3/00; B21K3/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/4981
Claims Analysis
Total Claims: 0
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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) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |