Patents Assigned to Ben A. Everson
  • Clogged filter indicator
    Patent number: 5351035
    Abstract: A self-contained sensing unit to be mounted on air duct between the filter and blower to monitor the condition of the filter. The sensor has a probe to be inserted into the duct downstream of the filter. The probe is in fluid communication with a bellows. When the filter becomes clogged, a negative pressure in the duct actuates the bellows which in turn closes a circuit from a battery to a signaling device.
    Type: Grant
    Filed: February 22, 1993
    Date of Patent: September 27, 1994
    Assignee: Ben A. Everson
    Inventor: Lonnie R. Chrisco