Patents by Inventor James F. Collum

James F. Collum 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).

  • Secure transmission system for a digital trunked radio system
    Patent number: 7697689
    Abstract: A security system for a digital trunked radio system having a digital control channel and a plurality of working channels, wherein said working channels are assigned for temporary use of individual radio units by digital control signals transmitted over said control channel, said control channel carrying digital control signals between a base site and said radio units, comprising a digital key, said key used to limit access to the system equipment and system control channel transmissions.
    Type: Grant
    Filed: March 5, 2007
    Date of Patent: April 13, 2010
    Assignee: Pine Valley Investments, Inc.
    Inventors: James F. Collum, William Oscar Janky, Eugene H. Peterson, III, Dennis Maddox
  • Secure transmission system for a digital trunked radio system
    Patent number: 7203318
    Abstract: A security system for a digital trunked radio system having a digital control channel and a plurality of working channels, wherein said working channels are assigned for temporary use of individual radio units by digital control signals transmitted over said control channel, said control channel carrying digital control signals between a base site and said radio units, comprising a digital key, said key used to limit access to the system equipment and system control channel transmissions.
    Type: Grant
    Filed: June 17, 2002
    Date of Patent: April 10, 2007
    Assignee: M/A-COM Private Radio Systems, Inc.
    Inventors: James F. Collum, William Oscar Janky, Eugene H. Peterson, III, Dennis Maddox
  • Secure transmission system for a digital trunked radio system
    Publication number: 20040203733
    Abstract: A security system for a digital trunked radio system having a digital control channel and a plurality of working channels, wherein said working channels are assigned for temporary use of individual radio units by digital control signals transmitted over said control channel, said control channel carrying digital control signals between a base site and said radio units, comprising a digital key, said key used to limit access to the system equipment and system control channel transmissions.
    Type: Application
    Filed: June 17, 2002
    Publication date: October 14, 2004
    Inventors: James F. Collum, William Oscar Janky, Eugene H. Peterson