US3487519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making axial flow fans
Assignee: HUDSON ENG CO
•
Filing: 1967-08-31
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Granted: 1970-01-06
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Expires: 1987-08-31
Abstract
No abstract record available.
Inventors
- 👤 Eugene M Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:01
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F01D11/127; B; B23; B23P; B23P15/00; B23P15/006; B29; B29C; B29C63/00; Y; Y10; Y10S; Y10S277/00; Y10S277/924; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49327; Y10T29/49826; Y10T29/49879
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3126149A
Cited
US2963307A
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GB793886A
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US3042365A
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US3068016A
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US3046648A
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US3083975A
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US3056583A
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US3227599A
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US3281307A
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US3346175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |