Patents by Inventor Allenn E. Martin

Allenn E. Martin 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).

  • Pneumatic direct digital controller
    Patent number: 5114070
    Abstract: A pneumatic direct digital control system comprising: an air inlet; an air outlet; a transducer for connecting the air inlet and the air outlet and controlling a flow of air therebetween; a power supply; a sensor; and a direct digital controller. The direct digital controller is operably connected to the power supply. Additionally, the controller is operably connected to and is controlling the transducer.
    Type: Grant
    Filed: November 6, 1990
    Date of Patent: May 19, 1992
    Assignee: American Standard Inc.
    Inventors: Philip C. Lilja, Paul W. Ehrlich, Allenn E. Martin