US3539826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active variable impedance device for large signal applications
Assignee: International Business Machines Corp
•
Filing: 1967-09-01
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Granted: 1970-11-10
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Expires: 1987-09-01
Abstract
No abstract record available.
Inventors
- 👤 William G Crouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:03
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/613; G06; G06G; G06G7/00; G06G7/12; G06G7/16; G06G7/163; H03C; H03C1/00; H03C1/36; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G5/00; H03G5/16; H03G5/24; H03G5/28; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/14; H04B3/146; H04B3/148
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3233177A
Cited
US3412340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |