Patent US3500431A successfully refreshed from Google Patents.
US2802138A
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US
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Computing elements and systems
Assignee: Unisys Corp
•
Filing: 1954-04-22
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Granted: 1957-08-06
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Expires: 1974-04-22
Abstract
No abstract record available.
Inventors
- 👤 Howard E Tompkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:52
CPC Classifications
H; H03; H03K; H03K29/00; G; G06; G06F; G06F7/00; G06F7/38; G06F7/388
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2137888A
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US2202511A
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US2244748A
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US2239407A
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US2454410A
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US2534372A
Cited
US2627587A
Cited
US2677779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |