Patents Assigned to Thor Dahl, Inc.
  • Envelope opening mechanism
    Patent number: 4189341
    Abstract: A method and mechanism for opening envelopes by chemical means.
    Type: Grant
    Filed: October 3, 1977
    Date of Patent: February 19, 1980
    Assignee: Thor Dahl, Inc.
    Inventors: John B. McPherson, William H. Gunther, Jr.
  • Apparatus for applying chemicals to envelopes
    Patent number: 4106432
    Abstract: Apparatus for applying a coating to edges of envelopes. The envelopes are fed from a stack feeding device to a first conveyor which conveys them past a roller which applies the coating to one edge. A dead plate receives the envelopes from the first conveyor and feeds them to a second conveyor which is at right angles to the first conveyor. Applicator rollers are placed on opposite sides of the second conveyor to coat opposing edges of the envelopes.
    Type: Grant
    Filed: April 19, 1976
    Date of Patent: August 15, 1978
    Assignee: Thor Dahl, Inc.
    Inventor: William H. Gunther, Jr.
  • Envelope opening process
    Patent number: 4082603
    Abstract: A method and mechanism for opening envelopes by chemical means.
    Type: Grant
    Filed: July 28, 1975
    Date of Patent: April 4, 1978
    Assignee: Thor Dahl, Inc.
    Inventors: John B. McPherson, William H. Gunther, Jr.
  • Envelope opening machine
    Patent number: 4069011
    Abstract: A machine for opening envelopes by heat process which have been previously treated with chemicals.
    Type: Grant
    Filed: April 27, 1976
    Date of Patent: January 17, 1978
    Assignee: Thor Dahl, Inc.
    Inventor: William H. Gunther, Jr.