Patents by Inventor Harold Ahrbeck

Harold Ahrbeck 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).

  • Thermoplastic pipe stub end
    Patent number: 4290456
    Abstract: An improved thermoplastic pipe stub end for welding to thermoplastic pipe is disclosed. The stub end has a flange portion integrally joined to a neck portion which has inner and outer surfaces and terminates at a welding face. The improvement resides in the reduction of the length of neck portion such that it extends from the flange a distance in millimeters of not greater than 1.5 .sqroot.O.D., where O.D. is the outer diameter in centimeters of the neck portion at the welding face. The improved stub end permits higher strength heat welds to be made by butt fusion between the thermoplastic stub end and a thermoplastic pipe to be joined thereto.
    Type: Grant
    Filed: July 13, 1977
    Date of Patent: September 22, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Harold Ahrbeck