US2932444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blower
Assignee: Spencer Turbine Co
•
Filing: 1957-09-13
•
Granted: 1960-04-12
•
Expires: 1977-09-13
Abstract
No abstract record available.
Inventors
- 👤 Kendall L Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:59
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/009
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US869868A
Cited
FR456307A
Cited
US1465401A
Cited
CH114697A
Cited
US1609584A
Cited
FR682295A
Cited
FR855407A
Cited
US2661145A
Cited
GB771837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-12 | 1963-10-12 | 1964-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-12 | 1967-10-12 | 1968-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-12 | 1971-10-12 | 1972-04-12 | $7700.00 | Window Closed / Lapsed |