US3505648A
Expired / Lapsed
US
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Arithmetic and logic system using ac and dc signals
Assignee: International Business Machines Corp
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Filing: 1966-09-28
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Granted: 1970-04-07
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Expires: 1986-09-28
Abstract
No abstract record available.
Inventors
- 👤 William Mcgovern
- 👤 David A Petersen
- 👤 Ralph D Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:52
CPC Classifications
G; G06; G06F; G06F9/00; G06F9/06; G06F9/30; G06F9/30003; G06F9/30007; G06F9/30032; G06F15/00; G06F15/76; G06F15/78; G06F7/00; G06F7/38; G06F7/48; G06F7/483; G06F7/57; G06F9/3001; G06F9/44; G06F9/448; G06F9/4482; G06F9/4484
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) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |