US2487581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical resistor and method of making same
Assignee: Individual
•
Filing: 1948-03-31
•
Granted: 1949-11-08
•
Expires: 1968-03-31
Abstract
No abstract record available.
Inventors
- 👤 Theodore R Palumbo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:22
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/001; C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; H01B; H01B1/00; H01B1/20; H01B1/24; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T403/00; Y10T403/47; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2133672A
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US648518A
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US1470300A
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FR699457A
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US1978323A
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US2057431A
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US2200521A
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US2392682A
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US2405449A
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US2414625A
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US2438732A
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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 |