Patents by Inventor David Littmann

David Littmann 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).

  • Multi-sound chamber stethoscope
    Patent number: 3951230
    Abstract: A stethoscope having a head wherein a diaphragm sound chamber is disposed within a housing which allows for the head to be used as a diaphragm sound chamber or a bell sound chamber without removal of the stethoscope head from the patient.
    Type: Grant
    Filed: January 31, 1975
    Date of Patent: April 20, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: David Littmann