US2487057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance unit and method of making same
Assignee: Individual
•
Filing: 1946-02-23
•
Granted: 1949-11-08
•
Expires: 1966-02-23
Abstract
No abstract record available.
Inventors
- 👤 Wilbur M Kohring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:00
CPC Classifications
H; H01; H01C; H01C1/00; H01C1/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087; Y10T29/49098; Y10T29/49099
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US540073A
Cited
US1208756A
Cited
US1739256A
Cited
US1857769A
Cited
US1796338A
Cited
US2087736A
Cited
US2150404A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-07 | 1953-05-09 | 1953-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-07 | 1957-05-09 | 1957-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-07 | 1961-05-09 | 1961-11-08 | $7700.00 | Window Closed / Lapsed |