US2487839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonlinear resistance element
Assignee: George W Borg Corp
•
Filing: 1945-11-07
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Granted: 1949-11-15
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Expires: 1965-11-07
Abstract
No abstract record available.
Inventors
- 👤 De Witt T Van Alen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:18
CPC Classifications
H; H01; H01C; H01C10/00; H01C10/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-14 | 1953-05-16 | 1953-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-14 | 1957-05-16 | 1957-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-14 | 1961-05-16 | 1961-11-15 | $7700.00 | Window Closed / Lapsed |