Patents by Inventor Thomas A. Callaghan

Thomas A. Callaghan 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).

  • Infusion apparatus able to recognize an appropriate time for servicing
    Patent number: 5304127
    Abstract: An infusion apparatus is provided with a clock, a power-on-time counter for counting a period of time in which power is supplied to the infusion apparatus from an AC power source or a backup battery for backing up the AC power source, a pump-on-time counter for counting a period of time in which a pump mechanism operates, and a battery-on-time counter for counting a period of time in which power is supplied to the infusion apparatus from the backup battery. A CPU displays a time value counted by the counters on a display unit. The time value displayed on the display unit indicates the degree of deterioration of charge capability of the backup battery, from which a time for replacing the backup battery and the other parts can be easily perceived.
    Type: Grant
    Filed: April 2, 1993
    Date of Patent: April 19, 1994
    Assignees: Sharp Kabushiki Kaisha, Baxter International Incorporated
    Inventors: Masafumi Kawahara, Joseph B. Matthews, Thomas Callaghan