Patent US2665057A successfully refreshed from Google Patents.
US2665057A
Expired / Lapsed
US
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Rotary blower
Assignee: Individual
•
Filing: 1952-06-18
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Granted: 1954-01-05
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Expires: 1972-06-18
Abstract
No abstract record available.
Inventors
- 👤 Walter Hellmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:45
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/08; F04C18/12; F04C18/30; F04C18/36; F04C18/14; F04C18/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US313415A
Cited
US589462A
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US622949A
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US912549A
Cited
US1000615A
Cited
US1192287A
Cited
FR497234A
Cited
FR567472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |