Patent US2850757A successfully refreshed from Google Patents.
US2850757A
Expired / Lapsed
US
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Surface cleaning tool
Assignee: Hoover Co
•
Filing: 1955-08-22
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Granted: 1958-09-09
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Expires: 1975-08-22
Abstract
No abstract record available.
Inventors
- 👤 Jack E Duff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:50
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/02; A47L9/06; A47L9/0633; A47L9/064; A47L9/0653
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US781532A
Cited
US1265789A
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US1826798A
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US1995084A
Cited
US2175639A
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US2214855A
Cited
GB613009A
Cited
US2734215A
Cited
US2658228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |