Patent US2863633A successfully refreshed from Google Patents.
US2863633A
Expired / Lapsed
US
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Hollow blades and manufacture thereof
Assignee: Stalker Development Co
•
Filing: 1952-04-19
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Granted: 1958-12-09
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Expires: 1972-04-19
Abstract
No abstract record available.
Inventors
- 👤 Edward A Stalker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:44
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/78; F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/186; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2405190A
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US2431647A
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US2506581A
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US2585871A
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US2613910A
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US2613911A
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US2559131A
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US2568726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |