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US2993223A
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Suction cleaning device
Assignee: Hoover Co
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Filing: 1959-06-19
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Granted: 1961-07-25
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Expires: 1979-06-19
Abstract
No abstract record available.
Inventors
- 👤 Don C Krammes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:31
CPC Classifications
A; A47; A47L; A47L11/00; A47L11/40; A47L11/408; A47L11/4088; A47L11/29; A47L11/30; A47L11/4083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2923956A
Cited
US1440026A
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US2407408A
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US2649758A
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US2673619A
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US2763880A
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US2953159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |