Amp LLC

Phone Devices Corporation

Jack Leo Bradbery

Robert David Hollyday

William Jeffrey Hudson, Jr

Allan Marin

An electronic telephone apparatus employs a pushbutton key array having multilevel switch contacts and a manually and automatically controlled signalling arrangement for output signalling in both the dial pulse and DTMF (Dual Tone Multifrequency) tone signalling formats. The signalling arrangement includes a memory storage and an automatic sequential dialing circuit to transmit various predetermined combinations of dial pulse trains of one or more digits and tone sequences useful in multiple PABX (Private Automatic Branch Exchange) networks, long haul microwave communication links between distant points and redialing of 'found-busy' numbers. The memory arrangemnt is provided for both the dial pulse and tone signalling circuitry and is controllable by a sequence initiate stage and an inhibit stage whereby the station apparatus operator selects the signalling modes, initiates the signalling and determines the timing of the signalling such as the interdigital and intertone spacing of individual digits or groups of digits by selectively inhibiting the automatic signalling sequence.

Pushbutton telephone apparatus with automatic dialing and combinational

A solderless filter assembly wherein a filter in the form of a sleeve having a hollow bore extending therethrough is placed in electrical contact with a mounting body positioned therearound and an electrically conductive pin passing through the bore of the filter without requirement of solder. This is accomplished by providing an internal spring positioned around the pin and having convex tines thereon which provide a pressure fit with the internal diameter of the filter sleeve and is frictionally locked onto the pin. A second spring having concave tines is positioned around the outer diameter of the filter sleeve and provides a pressure fit therewith, the outer spring also making electrical contact with the shell or mounting body surrounding the filter. The filter sleeve and spring members are isolated from the external environment by pot stops which are positioned within cut out regions of the mounting body. Potting material is then placed into the hollow regions in the mounting body and against the pot stop to lock the pin in place within the mounting body by providing a bond to both the pin and the mounting body as well as to the pot stop. One end of the pin has an enlarged region positioned within the potting material to prevent lateral or rotational movement of the pin after formation of the filter assembly. The mounting body also can include threads thereon for threading the filter assembly into a bulkhead or the like directly or for securing the filter assembly into a bulkhead by means of a mating nut. In addition, the mounting body can be made straight and the filter assembly can be soldered into the bulkhead.

Solderless filter assembly

The disclosure relates to a filter module which is self groundable when mounted on a printed circuit board. The filter modules include a pair of ground planes mounted normal to each other and each secured to the ground sleeves of the filters and also to a ground plane on the printed circuit board.

Growing community of inventors

Evergreen Park, IL, United States of America

Jack Leo Bradbery