Patent US2698129A successfully refreshed from Google Patents.
US2698129A
Expired / Lapsed
US
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Multistage axial fan with boundary layer control
Assignee: Joy Manufacturing Co
•
Filing: 1949-05-12
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Granted: 1954-12-28
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Expires: 1969-05-12
Abstract
No abstract record available.
Inventors
- 👤 Theodor H Troller
- 👤 Chester P Jenkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:16
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/009; Y; Y10; Y10S; Y10S415/00; Y10S415/914
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) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |