US3539831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching circuit including plural ranks of differential circuits
Assignee: Tektronix Inc
•
Filing: 1967-06-15
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Granted: 1970-11-10
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Expires: 1987-06-15
Abstract
No abstract record available.
Inventors
- 👤 Barrie Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:09
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/603; G; G06; G06G; G06G7/00; G06G7/12; G06G7/26; G06G7/28; H03K5/00; H03K5/15; H03K5/15013; H03K5/1506; H03K5/15073; H03M; H03M1/00; H03M1/06; H03M1/0617
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2653231A
Cited
US3216005A
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 |