Patent US4158861A successfully refreshed from Google Patents.
Patent US3544864A successfully refreshed from Google Patents.
US3544864A
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US
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Solid state field effect device
Assignee: Verizon Laboratories Inc
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Filing: 1967-08-31
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Granted: 1970-12-01
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Expires: 1987-08-31
Abstract
No abstract record available.
Inventors
- 👤 Paul Richman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:15
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G1/007; H10; H10D; H10D84/00; H10D84/80; H10D84/811; H10D99/00
Claims Analysis
Total Claims: 0
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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) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |