US2431939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrading machine
Assignee: Individual
•
Filing: 1945-08-11
•
Granted: 1947-12-02
•
Expires: 1965-08-11
Abstract
No abstract record available.
Inventors
- 👤 Franklin D Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:00
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/36; B24B3/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US433054A
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US961554A
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US1162304A
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US1726571A
Cited
US1895819A
Cited
US1831863A
Cited
US1773564A
Cited
US1963394A
Cited
US2021602A
Cited
US2161992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |