Patent US4093990A successfully refreshed from Google Patents.
Patent US2814440A successfully refreshed from Google Patents.
US2814440A
Expired / Lapsed
US
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Memory system
Assignee: International Standard Electric Corp
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Filing: 1952-09-04
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Granted: 1957-11-26
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Expires: 1972-09-04
Abstract
No abstract record available.
Inventors
- 👤 Eric M S Mcwhirter
- 👤 Frederick W Warden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:44
CPC Classifications
G; G06; G06K; G06K17/00; G06K17/0003; G06K17/0009; G06K13/00; G06K13/02; G06K13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2564089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-25 | 1961-05-27 | 1961-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-25 | 1965-05-27 | 1965-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-25 | 1969-05-27 | 1969-11-26 | $7700.00 | Window Closed / Lapsed |