Other

Bell Telephone Laboratories

Edward William Underhill

Donald D Huizinga

Donald R Means

James Arthur Whitcomb

The present invention provides an extension member for coupling with a quick coupler key. The extension member includes: a first member; a second member; a handle; and a third member. Methods of using the extension member for coupling with a pipe and a quick coupler key, which is coupled to a quick coupler assembly are also provided.

Extender

The present invention provides a removable fluid removal pump filter for mounting on a fluid intake housing of a fluid removal pump having a fluid intake housing coupled to a pump shaft coupled to a head assembly having a pump handle and a discharge port. The removable fluid removal pump filter includes: a first member and a second member, wherein the second member is coupled to the first member and extends toward the proximal end of the first member. Methods of using the removable fluid removal pump filter are also disclosed.

Removable fluid removal pump filter

In order to provide push-button telephone service to those telephone systems not equipped to respond to multifrequency dialing signals, it is necessary to convert push-button dialed digits into conventional dial pulses. A pulse train consisting of make and break intervals representing the dialed digit is electronically converted (107) into a corresponding series of make and break intervals on the telephone line (102, 103) by switching (106, 108-1, 108-2) a pulsing transistor (101) that is in series with the telephone line ON and OFF. In order to keep the pulsing transistor ON during nondialing intervals and during each make interval, and not attenuate the voice signal, the pulsing transistor is biased by an adjustable current source (105). The current needed to bias the pulsing transistor ON is linearly related to the telephone line current flowing through the emitter-collector path of the transistor, and which varies considerably from station-to-station. In order to minimize the current needed to bias the pulsing transistor, a current sensor (104) derives a signal proportional to the line current which, in turn, is fed back to the current source (105 ) in order to adjust the bias current to be proportional to the line current.

Dial pulsing circuit

An electronic key telephone station set includes a plurality of nonlocking line selection buttons. Adjacent each button is a pair of light emitting diode lamps, one for indicating which line selection button has been actuated and one for indicating which ones of other lines having an appearance on the station set are in use. Digital data coupled to and from the station set control the activation of the indicating lamps as well as the type of alerting signal generated to indicate an incoming call. Numerous other features may be advantageously implemented under data stream control.

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Knightstown, IN, United States of America

Edward William Underhill