Patent US2210724A successfully refreshed from Google Patents.
US2210724A
Expired / Lapsed
US
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Push-broom-type vacuum cleaner
Assignee: QUADREX CORP
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Filing: 1937-12-18
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Granted: 1940-08-06
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Expires: 1957-12-18
Abstract
No abstract record available.
Inventors
- 👤 Leathers Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:39
CPC Classifications
A; A47; A47L; A47L5/00; A47L5/12; A47L5/22; A47L5/28; A47L5/225; A47L9/00; A47L9/009; A47L9/10; A47L9/14; A47L9/1427; A47L9/149
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-08-06 | 1944-02-05 | 1944-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-08-06 | 1948-02-05 | 1948-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-08-06 | 1952-02-05 | 1952-08-06 | $7700.00 | Window Closed / Lapsed |