US2871504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Converters for vacuum cleaners
Assignee: Singer Co
•
Filing: 1953-12-10
•
Granted: 1959-02-03
•
Expires: 1973-12-10
Abstract
No abstract record available.
Inventors
- 👤 Francis A Gall
- 👤 Dirwood M Danforth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:45
CPC Classifications
A; A47; A47L; A47L5/00; A47L5/12; A47L5/22; A47L5/28; A47L5/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US742409A
Cited
US1210525A
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US1227142A
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US1773961A
Cited
US1575256A
Cited
FR624844A
Cited
US1920621A
Cited
GB519664A
Cited
US2310268A
Cited
US2525399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |