US2651796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carpet sweeper
Assignee: Harrisburg University of Science and Technology
•
Filing: 1948-11-13
•
Granted: 1953-09-15
•
Expires: 1968-11-13
Abstract
No abstract record available.
Inventors
- 👤 Robert S Wagner
- 👤 Albert J Duwe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:42
CPC Classifications
A; A47; A47L; A47L11/00; A47L11/40; A47L11/4072; A47L11/32; A47L11/33; A47L11/4036; A47L11/4041; A47L11/4052; A47L11/4058
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US424309A
Cited
US486371A
Cited
US1813325A
Cited
GB441175A
Cited
US2166977A
Cited
US2228528A
Cited
GB476932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |