Patent US2823889A successfully refreshed from Google Patents.
US2823889A
Expired / Lapsed
US
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Rotor construction and fabrication
Assignee: Stalker Development Co
•
Filing: 1950-04-05
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Granted: 1958-02-18
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Expires: 1970-04-05
Abstract
No abstract record available.
Inventors
- 👤 Edward A Stalker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:39
CPC Classifications
F; F16; F16H; F16H1/00; F16H1/28; F01; F01D; F01D5/00; F01D5/30; F01D5/3076; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49321; Y10T29/49336; Y10T29/49339
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) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |