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Patent US2972159A successfully refreshed from Google Patents.
US2972159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power sweeper
Assignee: Tennant Co
•
Filing: 1956-06-18
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Granted: 1961-02-21
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Expires: 1976-06-18
Abstract
No abstract record available.
Inventors
- 👤 Albert S Swanson
- 👤 Harlie J Kimmerle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:36
CPC Classifications
A; A47; A47L; A47L11/00; A47L11/24; A46; A46B; A46B13/00; A46B13/001; A46B13/003; E; E01; E01H; E01H1/00; E01H1/08; E01H1/0827; E01H1/0854
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-21 | 1964-08-22 | 1965-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-21 | 1968-08-22 | 1969-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-21 | 1972-08-22 | 1973-02-21 | $7700.00 | Window Closed / Lapsed |