US2500841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floor cleaning device
Assignee: EL Bruce Co
•
Filing: 1948-06-01
•
Granted: 1950-03-14
•
Expires: 1968-06-01
Abstract
No abstract record available.
Inventors
- 👤 Evan L Fellman
- 👤 Jr Walter G Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:40
CPC Classifications
A; A47; A47L; A47L13/00; A47L13/10; A47L13/28; A47L13/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US844865A
Cited
US916755A
Cited
US1469404A
Cited
US1540987A
Cited
US1568773A
Cited
US1679392A
Cited
US1593341A
Cited
US2304127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |