Patents by Inventor John B. McPherson

John B. McPherson 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).

  • 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.
  • 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.