US2521689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubbing shoe
Assignee: Individual
•
Filing: 1949-01-03
•
Granted: 1950-09-12
•
Expires: 1969-01-03
Abstract
No abstract record available.
Inventors
- 👤 Roy J Champayne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:58
CPC Classifications
B; B24; B24D; B24D15/00; B24D15/02; B24D15/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US40231A
Cited
US408433A
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US753251A
Cited
US913863A
Cited
US1855635A
Cited
US2282043A
Cited
US2242545A
Cited
US2464296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |