Patent US5936578A successfully refreshed from Google Patents.
US3427443A
Expired / Lapsed
US
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Instruction execution marker for testing computer programs
Assignee: International Business Machines Corp
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Filing: 1965-04-08
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Granted: 1969-02-11
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Expires: 1985-04-08
Abstract
No abstract record available.
Inventors
- 👤 Clarence T Apple
- 👤 James T Dervan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:24
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/36; G06F11/362; G06F11/3648
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3222653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |