US2889570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air supported suction cleaners
Assignee: Hoover Co
•
Filing: 1956-10-15
•
Granted: 1959-06-09
•
Expires: 1976-10-15
Abstract
No abstract record available.
Inventors
- 👤 Jack E Duff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:32
CPC Classifications
A; A47; A47L; A47L7/00; A47L7/04; A47L7/06; A47L5/00; A47L5/12; A47L5/22; A47L5/36; A47L5/365
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE524095C
Cited
US1912386A
Cited
US2064587A
Cited
US2328184A
Cited
US2743787A
Cited
US2780826A
Cited
US2751038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |