MICHAEL W LEIBOWITZ
Pilots at Chadwick Dr, Charleston, SC
License number
South Carolina A2169411
Issued Date
Apr 2015
Expiration Date
Apr 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
68 Chadwick Dr, Charleston, SC 29407
Personal information
See more information about MICHAEL W LEIBOWITZ at radaris.comName
Address
Phone
PO Box 31418, Charleston, SC 29417
1591 Savannah Hwy, Charleston, SC 29407
68 Chadwick Dr, Chas, SC 29407
Professional information
Key Telephone Hold Arrangement
US Patent:
4311880, Jan 19, 1982
Filed:
Nov 10, 1980
Appl. No.:
6/205259
Inventors:
Gerry C. Balzer - Freehold NJ
Alan M. Gordon - Matawan NJ
Michael W. Leibowitz - Charleston SC
Karl R. Wittig - New York NY
Alan M. Gordon - Matawan NJ
Michael W. Leibowitz - Charleston SC
Karl R. Wittig - New York NY
Assignee:
Bell Telephone Laboratories, Incorporated - Murray Hill NJ
International Classification:
H04Q 518
US Classification:
179 99H
Abstract:
There is disclosed a line circuit for establishing a hold condition on a communication line, extending between a switching machine and a key telephone station, during an open switching interval (OSI) when no current flows on the communication line. The control signal required to enable the hold circuit is arranged to be time dependent. For a fixed time interval, which bridges the OSI period, after the telephone station answers a ringing line a hold condition is enabled (402) exclusively by a control signal on the A lead from the station. This time dependent hold enable arrangement permits a hold capability during an OSI condition. After this time interval elapses (403) a hold condition is enabled by (404) a joint signal condition on the A lead and a current continuity condition on the communication line.