US3054909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic reference switching circuit
Assignee: International Business Machines Corp
•
Filing: 1958-12-31
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Granted: 1962-09-18
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Expires: 1978-12-31
Abstract
No abstract record available.
Inventors
- 👤 Ii Gwynne W Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:09
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/30; H; H03; H03K; H03K17/00; H03K17/18; H03K17/51; H03K17/56; H03K17/60
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) | 1965-09-17 | 1966-03-19 | 1966-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-17 | 1970-03-19 | 1970-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-17 | 1974-03-19 | 1974-09-18 | $7700.00 | Window Closed / Lapsed |