Patent US2740579A successfully refreshed from Google Patents.
US2740579A
Expired / Lapsed
US
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Portable circulating blower for space heaters
Assignee: Individual
•
Filing: 1952-08-18
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Granted: 1956-04-03
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Expires: 1972-08-18
Abstract
No abstract record available.
Inventors
- 👤 Samuel H Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:52
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/60; F04D29/64; F04D29/644; F04D29/646; F04D29/58; F04D29/582; F04D29/5853
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US925327A
Cited
US1790021A
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US2169232A
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US2227765A
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US2435645A
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US2553278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |