Patents by Inventor William D. Evans

William D. Evans 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).

  • Patent number: 7496767
    Abstract: A secure content object protects electronic documents from unauthorized use. The secure content object includes an encrypted electronic document, a multi-key encryption table having at least one multi-key component, an encrypted header and a user interface device. The encrypted document is encrypted using a document encryption key associated with a multi-key encryption method. The encrypted header includes an encryption marker formed by a random number followed by a derivable variation of the same random number. The user interface device enables a user to input a user authorization. The user authorization is combined with each of the multi-key components in the multi-key encryption key table and used to try to decrypt the encrypted header. If the encryption marker is successfully decrypted, the electronic document may be decrypted. Multiple electronic documents or a document and annotations may be protected by the secure content object.
    Type: Grant
    Filed: January 19, 2001
    Date of Patent: February 24, 2009
    Assignee: Xerox Corporation
    Inventor: William D. Evans
  • Patent number: 6668085
    Abstract: An improved method of deriving the correct text from text with errors converted from a character recognition device includes the need for significantly less human intervention for correction of the converted text.
    Type: Grant
    Filed: August 1, 2000
    Date of Patent: December 23, 2003
    Assignee: Xerox Corporation
    Inventor: William D. Evans
  • Publication number: 20020099947
    Abstract: A secure content object protects electronic documents from unauthorized use. The secure content object includes an encrypted electronic document, a multi-key encryption table having at least one multi-key component, an encrypted header and a user interface device. The encrypted document is encrypted using a document encryption key associated with a multi-key encryption method. The encrypted header includes an encryption marker formed by a random number followed by a derivable variation of the same random number. The user interface device enables a user to input a user authorization. The user authorization is combined with each of the multi-key components in the multi-key encryption key table and used to try to decrypt the encrypted header. If the encryption marker is successfully decrypted, the electronic document may be decrypted. Multiple electronic documents or a document and annotations may be protected by the secure content object.
    Type: Application
    Filed: January 19, 2001
    Publication date: July 25, 2002
    Applicant: Xerox Corporation
    Inventor: William D. Evans
  • Patent number: 3946978
    Abstract: A window plate member is affixed to an inside surface of a window casing. An elevating plate member has a lower end hingedly affixed to the window plate member and extending upward from the window plate member to an area above the window casing for rotation from a position closely adjacent the surface of a wall in which the window casing is mounted to a position perpendicular to such surface. A rod connecting member comprises a rod of U-shape having a pair of legs. A first free end of the rod extends at right angles to the plane of the legs and is pivotally mounted on the upper end of the elevating plate member in a manner whereby the legs are movable in a plane perpendicular to the surface of the wall. The rod has a second free end in the plane of the legs for accommodating a tubular curtain rod.
    Type: Grant
    Filed: May 27, 1975
    Date of Patent: March 30, 1976
    Assignee: The Raymond Lee Organization, Inc.
    Inventor: William D. Evans