Patent US2838690A successfully refreshed from Google Patents.
US2838690A
Expired / Lapsed
US
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Push-push transistor circuits
Assignee: Unisys Corp
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Filing: 1955-12-23
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Granted: 1958-06-10
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Expires: 1975-12-23
Abstract
No abstract record available.
Inventors
- 👤 Jr John Presper Eckert
- 👤 Jr Harry J Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:10
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/02; H03K5/023; H03K17/00; H03K17/51; H03K17/56; H03K17/687; H03K17/6871; H03K3/00; H03K3/02; H03K3/26; H03K3/30; H03K3/33
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |