US2980833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Point contact rectifier device
Assignee: Monsanto Chemicals Ltd
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Filing: 1959-06-01
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Granted: 1961-04-18
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Expires: 1979-06-01
Abstract
No abstract record available.
Inventors
- 👤 Arnold S Epstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:17
CPC Classifications
C; C09; C09B; C09B47/00; C09B47/04; C09B47/045; H; H10; H10K; H10K10/00; H10K85/00; H10K85/30; H10K85/311
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |