US2951630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal fans
Assignee: Westinghouse Electric Corp
•
Filing: 1957-08-30
•
Granted: 1960-09-06
•
Expires: 1977-08-30
Abstract
No abstract record available.
Inventors
- 👤 James D Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:53
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/46; F04D29/462; F04D29/464; F05; F05D; F05D2250/00; F05D2250/50; F05D2250/51
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US820398A
Cited
US820399A
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GB191101326A
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FR542597A
Cited
US1862523A
Cited
US2205902A
Cited
US2452274A
Cited
US2635548A
Cited
FR1068014A
Cited
US2767905A
Cited
US2798657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |