Patent US3140042A successfully refreshed from Google Patents.
US3140042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheels for centrifugal fans of the forward curved multiblade type
Assignee: Individual
•
Filing: 1961-08-15
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Granted: 1964-07-07
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Expires: 1981-08-15
Abstract
No abstract record available.
Inventors
- 👤 Fujii Noriyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:32
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/281; F04D29/282; F04D29/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1749528A
Cited
US1910943A
Cited
AT153419B
Cited
US2254629A
Cited
US2366251A
Cited
US2439933A
Cited
GB710391A
Cited
US2856675A
Cited
US2991004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |