Patent US2517670A successfully refreshed from Google Patents.
US2517670A
Expired / Lapsed
US
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Converter attachment for suction cleaners
Assignee: Hoover Co
•
Filing: 1944-09-16
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Granted: 1950-08-08
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Expires: 1964-09-16
Abstract
No abstract record available.
Inventors
- 👤 Warren A Humphrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:03
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)
US1294473A
Cited
US1856136A
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US1848314A
Cited
US2024260A
Cited
US2080480A
Cited
US2333494A
Cited
US2416786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-07 | 1954-02-06 | 1954-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-07 | 1958-02-06 | 1958-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-07 | 1962-02-06 | 1962-08-08 | $7700.00 | Window Closed / Lapsed |