Patent US3119987A successfully refreshed from Google Patents.
US3119987A
Expired / Lapsed
US
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Signal change detector
Assignee: Unisys Corp
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Filing: 1960-05-27
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Granted: 1964-01-28
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Expires: 1980-05-27
Abstract
No abstract record available.
Inventors
- 👤 Peter E Slavin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:06
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/32; G06; G06F; G06F7/00; G06F7/02; G11B27/102; G11B5/00; G11B5/48; G11B5/54; G11B5/55
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
119 words
IN A MAGNETIC DRUM SYSTEM INVOLVING A PLURALITY OF INFORMATION TRACKS HAVING ADDRESSES DESIGNATED BY A BINARY CODED SIGNAL CHARACTERIZED BY A SERIES OF SIGNALS OF A FIRST OR SECOND LEVEL, A CIRCUIT FOR DETECTING A CHANGE IN AN ADDRESS FROM A PREVIOUS ADDRESS COMPRISING A PLURALITY OF SATURABLE REACTORS EACH HAVING A FIRST AND A SECOND STABLE STATE OF OPERATION, EACH OF SAID SATURABLE REACTORS HAVING INPUT, OUTPUT AND RESET WINDINGS WITH THE INDUCTANCE OF SAID INPUT WINDINGS BEING SUBSTANTIALLY GREATER THAN THAT OF SAID RESET WINDINGS, MEANS FOR APPLYING SAID BINARY CODED SIGNALS TO THE INPUT WINDINGS OF SAID SATURABLE REACTORS, SAID BINARY SIGNAL OF SAID FIRST LEVEL BEING CAPABLE OF DRIVING AN ASSOCIATED SATURABLE REACTOR INTO
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) | 1967-01-27 | 1967-07-29 | 1968-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-27 | 1971-07-29 | 1972-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-27 | 1975-07-29 | 1976-01-28 | $7700.00 | Window Closed / Lapsed |