US3254157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic core scanning arrangement for electronic telephone switching system
Assignee: AT&T Inc
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Filing: 1963-01-09
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Granted: 1966-05-31
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Expires: 1983-01-09
Abstract
No abstract record available.
Inventors
- 👤 Anthony M Guercio
- 👤 Harold F May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:45
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/20; H; H03; H03K; H03K17/00; H03K17/51; H03K17/80; H03K17/82; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
IN A SCANNING ARRANGEMENT HAVING A PAIR OF SERIALLY CONNECTED MAGNETIC CORE MATRIX SWITCHES FOR INTERROGATING ROWS OF FERROD MONITORING DEVICES, THE COMBINATION ACCORDING TO WHICH EACH CORE MATRIX INCLUDES A PLURALITY OF INDIVIDUALLY-ADDRESSABLE ROW SELECT AND COLUMN SELECT WINDINGS, A NORMAL BIAS LOOP FOR APPLYING A BIAS TO OPPOSE THE EFFECT PRODUCED BY THE ADDRESSING OF ANY SAID SELECT WINDINGS, A SOURCE OF EMERGENCY BIAS, AND A RELAY HAVING A WINDING IN SAID BIAS LOOP AND CONTACTS ASSOCATED WITH A ROW SELECT WINDINGS AND SAID SOURCE OF EMERGENCY BIAS, SAID RELAY BEING RELEASABLE TO SERIALLY CONNECT SAID ROW SELECT WINDINGS WITH SAID SOURCE OF EMERGENCY BIAS TO APPLPY AN EMERGENCEY HAVING AN EFFECT OPPOSITE TO THAT PRODUCED BY SAID FIRST-MENTIONED BIAS-.
Claim 2
Dependent Claim
122 words
IN A SCANNING ARRANGEMENT HAVING A PAIR OF SERIALLY CONNECTED MAGNETIC CORE MATRIX SWITCHES FOR INTERROGATING ROWS OF FERROD MONITORING DEVICES, THE COMBINATION ACCORDING TO WHICH EACH CORE MATRIX INCLUDES A PLURALITY OF INDIVIDUALLY-ADDRESSABLE ROW SELECT AND COLUMN SELECT WINDINGS, A NORMAL BIAS LOOP FOR APPLYING A BIAS TO OPPOSE THE EFFECT PRODUCED BY THE ADDRESSING OF ANY SAID SELECT WINDINGS, A SOURCE OF EMERGENCY BIAS, AND A RELAY HAVING A WINDING IN SAID BIAS LOOP AND CONTACTS ASSOCATED WITH A ROW SELECT WINDINGS AND SAID SOURCE OF EMERGENCY BIAS, SAID RELAY BEING RELEASABLE TO SERIALLY CONNECT SAID ROW SELECT WINDINGS WITH SAID SOURCE OF EMERGENCY BIAS TO APPLPY AN EMERGENCEY HAVING AN EFFECT OPPOSITE TO THAT PRODUCED BY SAID FIRST-MENTIONED BIAS-.
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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |