Patent US3017620A successfully refreshed from Google Patents.
US3017620A
Expired / Lapsed
US
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Ring checking circuit
Assignee: International Business Machines Corp
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Filing: 1957-03-08
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Granted: 1962-01-16
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Expires: 1977-03-08
Abstract
No abstract record available.
Inventors
- 👤 Abzug Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:24
CPC Classifications
G; G06; G06F; G06F9/00; G06F9/06; G06F9/30; G01; G01R; G01R31/00; G01R31/28; G01R31/317; G01R31/3181; G01R31/3185; G01R31/318522; G01R31/31853; H; H03; H03K; H03K21/00; H03K21/40
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) | 1965-01-15 | 1965-07-17 | 1966-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-15 | 1969-07-17 | 1970-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-15 | 1973-07-17 | 1974-01-16 | $7700.00 | Window Closed / Lapsed |