Patents by Inventor Stephan S. Richman

Stephan S. Richman 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).

  • Method and apparatus for determining the accuracy of a sphygmomanometer
    Patent number: 4269058
    Abstract: A method and apparatus for determining the accuracy of a sphygmomanometer whereby the user attaches the sphygmomanometer pressure gauge in an airtight manner onto one end of an air passageway located in a stand, draws a known volume of air through a venting valve attached to the other end of the passageway and into a syringe attached to the venting valve, injects the known volume of air into the sphygmomanometer pressure gauge via the passageway and determines the pressure reading on the face of the pressure gauge. If necessary, the user adjusts the bellows of the pressure gauge to correspond with the reading marked on the syringe and repeats the procedure for different air volumes and pressures.
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: May 26, 1981
    Assignee: Marshall Electronics, Inc.
    Inventor: Stephan S. Richman