Patent US2157794A successfully refreshed from Google Patents.
US2946986A
Expired / Lapsed
US
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Communications system
Assignee: International Business Machines Corp
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Filing: 1956-04-17
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Granted: 1960-07-26
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Expires: 1976-04-17
Abstract
No abstract record available.
Inventors
- 👤 Donald A Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:07
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/08; G06F11/10; G06F11/0703; G06F11/0751; G06F11/0754; G06F11/076; G06F13/00; G06F13/10; G06F13/12; G06F15/00; G06F15/16; H; H04; H04L; H04L12/00; H04L12/28; H04L12/40
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) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |