Patents by Inventor Jeffrey W. Frederickson

Jeffrey W. Frederickson 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).

  • Apparatus and method for dispensing solution to prevent smear in the manufacture of printed circuit boards
    Patent number: 4917547
    Abstract: A method and apparatus for dispensing a smear-preventing solution onto a drill bit used for drilling printed circuit boards includes a drilling jig having a drill bit for engaging the printed circuit board and a dispensing system for dispensing a smear-preventing solution under pressure so that it sprays onto the drill bit through a hole in a pressure foot as the drill bit engages the printed circuit board. A switch mounted on the drilling jig controls the dispensing of the solution so that the solution is dispensed during the time that the drill bit is in the vicinity of the printed circuit board, and is turned off when the drill bit leaves the printed circuit board, or when the drill is turned off. A vacuum hose connected to the housing creates a low pressure condition adjacent the drill bit which provides for coating the drill bit while the solution is being dispensed, and for pulling the excess solution and debris created by the drill bit away from the surface of the printed circuit board.
    Type: Grant
    Filed: February 9, 1989
    Date of Patent: April 17, 1990
    Inventors: Jeffrey W. Frederickson, Douglas R. Kocher
  • Solution for use in the prevention of smear in the manufacture of printed circuit boards
    Patent number: 4913740
    Abstract: A solution and a method of using it for preventing smear in the manufacture of printed circuit boards includes monoethanolamine combined with a fatty acid for neutralizing the active amine except in the presence of relatively high heat, and a surface tension reducing agent. The solution is applied to the printed circuit board as holes are being drilled. The friction of the drill bit on the printed circuit board generates heat which activates the amine allowing it to attack the inner glass epoxy walls of the printed circuit board and prevent smear.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: April 3, 1990
    Inventor: Jeffrey W. Frederickson
  • Method and solution for the prevention of smear in the manufacture of printed circuit boards
    Patent number: 4913931
    Abstract: A solution and a method of using it for preventing smear in the manufacture of printed circuit boards includes monoethanolamine combined with a fatty acid for neutralizing the active amine except in the presence of relatively high heat, and a surface tension reducing agent. The solution is applied to the printed circuit board as holes are being drilled. The friction of the drill bit on the printed circuit board generates heat which activates the amine allowing it to attack the inner glass epoxy walls of the printed circuit board and prevent smear.
    Type: Grant
    Filed: August 18, 1987
    Date of Patent: April 3, 1990
    Inventor: Jeffrey W. Frederickson