Patents by Inventor David A. Malmsten

David A. Malmsten 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).

  • Power interruption monitoring apparatus
    Patent number: 6229450
    Abstract: Apparatus for monitoring interruptions in utility power that includes a utility power plug for connection to a utility wall socket to provide a signal indicative of loss of utility power. A counter is responsive to such signal for counting and displaying the number of power interruptions, and a timer is responsive to such signal for measuring and displaying time duration of power interruptions. An operator switch is coupled to the timer for selectively measuring and displaying either duration of the latest power interruption or total duration of all power interruptions. The counter and timer may be reset at the option of an operator.
    Type: Grant
    Filed: March 15, 1999
    Date of Patent: May 8, 2001
    Assignee: The Detroit Edison Company
    Inventor: David A. Malmsten