Patent US2457142A successfully refreshed from Google Patents.
US2457142A
Expired / Lapsed
US
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Fan for suction cleaners
Assignee: BIRTMAN ELECTRIC Co
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Filing: 1945-01-06
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Granted: 1948-12-28
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Expires: 1965-01-06
Abstract
No abstract record available.
Inventors
- 👤 Edward A French
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:34
CPC Classifications
F; F04; F04D; F04D17/00; F04D17/08; F04D17/16; F04D17/164; F04D29/00; F04D29/40; F04D29/42; F04D29/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1023873A
Cited
GB191403626A
Cited
GB102418A
Cited
US1281478A
Cited
CH103721A
Cited
US1722721A
Cited
US1670452A
Cited
GB231165A
Cited
US2245953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |