Patents by Inventor John L Larson

John L Larson 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).

  • Fan with damper
    Patent number: 8513839
    Abstract: A fan with damper includes a motor and a fan located in a duct ventilation passage. The motor is connected with the fan to drive the fan and move air or other gases through the duct. The motor has a drive shaft that slides along its length between on and off positions. A damper is also located in the passage, is operatively connected with the drive shaft such that the damper moves to an open position when the drive shaft slides to its on position and the damper moves to a closed position when the drive shaft slides to its off position.
    Type: Grant
    Filed: September 20, 2010
    Date of Patent: August 20, 2013
    Inventors: John L Larson, Steven J Larson