Patents by Inventor Roger G. Cleffman

Roger G. Cleffman 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 for splicing tread strips
    Patent number: 4173509
    Abstract: A machine for splicing or joining the ends of two precured rubber tread strips each having a pattern of ribs and grooves in one surface thereof. The machine includes first and second tread-clamping assemblies each of which grips the opposite surfaces of one of the tread strips between two elements and further includes power means for moving one of the assemblies toward the other in order to tightly abut the ends of the tread strips while heat is applied to effect vulcanization of a bonding material which previously has been inserted between the ends.
    Type: Grant
    Filed: January 18, 1978
    Date of Patent: November 6, 1979
    Assignee: Bandag Incorporated
    Inventors: Ralph C. Raabe, Roger G. Cleffman, Raymond G. Stratton
  • Splicing of tread strips
    Patent number: 4082592
    Abstract: A machine for splicing or joining the ends of two precured rubber tread strips each having a pattern of ribs and grooves in one surface thereof. The machine includes first and second tread-clamping assemblies each of which grip the opposite surfaces of one of the tread strips between two elements and further includes power means for moving one of the assemblies toward the other in order to tightly abut the ends of the tread strips while heat is applied to effect vulcanization of a bonding material which previously has been inserted between the ends.
    Type: Grant
    Filed: January 15, 1976
    Date of Patent: April 4, 1978
    Assignee: Bandag Incorporated
    Inventors: Ralph C. Raabe, Roger G. Cleffman, Raymond G. Stratton