Patents by Inventor Charles T. Randolph

Charles T. Randolph 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).

  • Patent number: 5197655
    Abstract: Methods and apparatus are provided for applying solder in precise amounts to fine pitch leads such as those suitable for direct chip attachment (DCA) or flip-chip applications by using a heated platen to apply pressure to solder overlaying a plurality of lands on circuitized substrate. In one embodiment paste solder screened through a mask having apertures each corresponding to a plurality of land locations. In another embodiment, a web of solder foil is accurately positioned over a plurality of fine pitch lands. In each embodiment, a heated platen includes at least one active element corresponding in size and shape to the area having a plurality of fine pitch lands. A third embodiment includes individual platens for lands to which solder is to be applied.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: March 30, 1993
    Assignee: International Business Machines Corporation
    Inventors: Arthur L. Leerssen, Everitt W. Mace, Issa S. Mahmoud, Charles T. Randolph, John Reece, Gaston G. Settle, Phong T. Truong, Srini V. Vasan