Patents by Inventor Michael D. Dunham

Michael D. Dunham 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: 5402908
    Abstract: A divisible container apparatus comprising a molded plastic tapered cylindrical open head container, a divider having a centrally located upstanding hollow handle and a tapered peripheral skirt, the divider being locatable within the container in parallel, spaced relationship to the bottom and supported by a plurality of interior support ledges with the peripheral skirt in sealing engagement with the interior wall of the container. A snap-on lid is provided for the container along with a bail for carrying the container apparatus and its contents.
    Type: Grant
    Filed: December 20, 1993
    Date of Patent: April 4, 1995
    Assignee: Letica Corporation
    Inventors: Jeffrey A. Warden, Michael D. Dunham, Sr.
  • Patent number: 4791565
    Abstract: Apparatus for controlling the use of software in accordance with authorized software license limits, including a limit of the number of concurrent usages of a particular software in a computer system having one or more operator terminals and a central processor containing the software. The apparatus includes a receiver that monitors usage requests from the software in the central processor. A microprocessor based controller accesses authorized use data stored in an EEPROM. Depending on the propriety of usage requests, the controller and an interruptor and transmitter coupled to the central processor and its software prevents operation of the software and/or provides warning messages on the terminal screen.
    Type: Grant
    Filed: June 20, 1984
    Date of Patent: December 13, 1988
    Assignee: Effective Security Systems, Inc.
    Inventors: Michael D. Dunham, Thomas M. Dykstra, Donald W. Vahlsing, Paul L. Ehlers