US2739281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling the rise and decay of an electric current
Assignee: Robotron Corp
•
Filing: 1951-10-26
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Granted: 1956-03-20
•
Expires: 1971-10-26
Abstract
No abstract record available.
Inventors
- 👤 Stuart C Rockafellow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:14
CPC Classifications
B; B23; B23D; B23D21/00; B23D21/06; B23D21/08; B23K; B23K11/00; B23K11/24; B23K11/248
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2443660A
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US2590582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |