Patents by Inventor Douglas H. Cameron

Douglas H. Cameron 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).

  • Magnetic tape cartridge with removable spool
    Patent number: 4002238
    Abstract: A tape cartridge for semi-permanently housing a removable tape spool rotatably supported in the cartridge by a pair of spring biased dowels that serve as axles for the spool and are associated with and held by a pair of collars that fit in apertures in the end walls of the cartridge.
    Type: Grant
    Filed: November 21, 1975
    Date of Patent: January 11, 1977
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Douglas H. Cameron, Bryan M. Clem