Patents by Inventor Gerald B. Fefferman

Gerald B. Fefferman 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).

  • Maskless process for applying a patterned solder mask coating
    Patent number: 4459320
    Abstract: A maskless process is disclosed for applying a patterned solder mask coating to a circuit board (31). In accordance with the process, there is applied to the surface (30) of the circuit board an uncured material (32) having a cure reaction which is susceptible to inhibition by the presence of oxygen. The surface of the circuit board is covered with the material to a first predetermined thickness. This first predetermined thickness of material on land areas (34) surrounding holes (36) in the circuit board is diminished to a second predetermined thickness by allowing a portion of the material on the land areas to flow into the holes. The uncured material is exposed to a first energy source which delivers a quantity of energy such that a surface layer (38) having the second predetermined thickness has its cure reaction substantially inhibited due to the presence of oxygen.
    Type: Grant
    Filed: December 13, 1982
    Date of Patent: July 10, 1984
    Assignee: AT&T Bell Laboratories
    Inventor: Gerald B. Fefferman