Patents by Inventor Erwin Hawle

Erwin Hawle 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).

  • A method of making a clamping ring for use in a pipe joint
    Patent number: 4706529
    Abstract: A clamping ring for use in pipe joints has an inside surface which is formed with generally peripherally extending indentations for axially fixing a pipe. In order to prevent an occurrence of dangerous stress concentrations in pipes in contact with such clamping rings and to permit such rings to be manufactured economically, the clamping ring is formed on its inside surface with a multiplicity of generally peripherally extending indentations, each of which extends only along part of the periphery of said inside surface, and said indentations are offset from each other in said peripheral directions and adjoint or overlap.
    Type: Grant
    Filed: October 23, 1986
    Date of Patent: November 17, 1987
    Assignee: E. Hawle & Co.
    Inventor: Erwin Hawle
  • Clamping ring for use in a pipe joint
    Patent number: 4657288
    Abstract: A clamping ring for use in pipe joints has an inside surface which is formed with generally peripherally extending indentations for axially fixing a pipe. In order to prevent an occurrence of dangerous stress concentrations in pipes in contact with such clamping rings and to permit such rings to be manufactured economically, the clamping ring is formed on its inside surface with a multiplicity of generally peripherally extending indentations, each of which extends only along part of the periphery of said inside surface, and said indentations are offset from each other in said peripheral directions and adjoin or overlap.
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: April 14, 1987
    Assignee: E. Hawle & Co.
    Inventor: Erwin Hawle