Patents by Inventor Charles T. Hathaway

Charles T. Hathaway 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).

  • Method of forming plastic envelopes
    Patent number: 4497679
    Abstract: The invention includes apparatus for and process of forming a plurality of plastic mounting envelopes from continuous plastic sheet material through cutting the plastic and bead sealing the margins by providing a high energy source to sever the plastic and bond the marginal edge of said plastic without physical contact.The invention also includes said plastic envelopes to serve as mounts and protectors for receiving flat paper objects such as stamps, letters, etc.
    Type: Grant
    Filed: October 13, 1981
    Date of Patent: February 5, 1985
    Inventor: Charles T. Hathaway