Patents by Inventor John T. Callahan

John T. Callahan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Wave-soldering a member to an article
    Patent number: 4421265
    Abstract: A solder mask (62) of special construction is mounted on each of a plurality of crystal filters (10) having continuous seams (16) defined by peripheral edges (20) of filter metal covers (14) and peripheral portions (18) of filter metal headers (12). The crystal filter-solder mask assemblies (10,62) then are passed over a solder wave (24) to solder the continuous seams (16) of the crystal filters (10) simultaneously. The crystal filters (10) are suspended on magnetic carriers (104) of an endless conveyor (106) as the filters pass over the solder wave. During the wave-soldering operation the solder masks (62) preclude solder from access to various critical areas of the crystal filters (10).
    Type: Grant
    Filed: April 10, 1981
    Date of Patent: December 20, 1983
    Assignee: Western Electric Company, Inc.
    Inventors: Albert E. Boyer, John T. Callahan, Peter P. Filocamo
  • Combination tool
    Patent number: D828135
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: September 11, 2018
    Inventors: John T. Callahan, Jr., Dorothy A. Callahan