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USRE27422E Expired / Lapsed US ⏱️ 0.0 years remaining

Schoeffler automatic recall switching system

Assignee: —
•
Filing: 1971-11-05
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Granted: 1972-07-04
•
Expires: 1991-11-05
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Abstract

Abstract AN ARRANGEMENT IS DISCLOSED FOR AUTOMATICALLY ESTABLISHING A CALLING CONNECTION FROM A PRIVILEGED TELEPHONE CUSTOMER TO A PREVIOUSLY CALLED STATION IN RESPONSE TO AN ABBREVIATED DIALED CODE. THE CALLED DIRECTORY NUMBER DIALED FROM THE STATION OF A PRIVILEGED CUSTOMER IS AUTOMATICALLY WRITTEN INTO A DESIGNATED LOCATION OF A CENTRAL MEMORY TO THE EXCLUSION OF ANY PRIORLY WRITTEN DIRECTORY NUMBER. THE PRIVILEGED CUSTOMER CAN INITIATE RETRIEVAL OF THE LAST CALLED DIRECTORY NUMBER FROM THE DESIGNATED LOCATION BY DIALING AN ABBREVIATED NUMBER. THE DIRECTORY NUMBER RETRIEVED FROM THE DESIGNATED LOCATION IS THEN AUTOMATICALLY USED TO ESTABLISH A CALLING CONNECTION TO THE STATION DEFINED THEREBY.

Inventors

No inventors recorded.

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 11:24
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/424

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-07-04 1976-01-03 1976-07-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-07-04 1980-01-03 1980-07-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-07-04 1984-01-03 1984-07-04 $7700.00 Window Closed / Lapsed

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