Patent US2968773A successfully refreshed from Google Patents.
US1697918A
Expired / Lapsed
US
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Floor-polishing attachment for vacuum cleaners
Assignee: Individual
•
Filing: 1925-05-28
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Granted: 1929-01-08
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Expires: 1945-05-28
Abstract
No abstract record available.
Inventors
- 👤 Walter L Keefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:21
CPC Classifications
A; A47; A47L; A47L11/00; A47L11/40; A47L11/4036; A47L11/4038; A47L11/02; A47L11/20; A47L11/201; A47L11/204; A47L11/206; A47L11/2065; A47L11/4063; A47L11/4069; A47L11/408; A47L11/4083; A47L11/4094
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) | 1932-01-08 | 1932-07-09 | 1933-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-01-08 | 1936-07-09 | 1937-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-01-08 | 1940-07-09 | 1941-01-08 | $7700.00 | Window Closed / Lapsed |