Patents by Inventor Charles Birnstiel

Charles Birnstiel 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).

  • Elevated rail transit guideway with noise attenuators
    Patent number: 4142468
    Abstract: An elevated dual-rail transit guideway in which the structural spanning members are shaped so as to serve also as baffles for suppressing the propagation of noise into the surroundings. The interior surface of the baffles may be treated with sound absorbing material to further improve their effectiveness.
    Type: Grant
    Filed: April 7, 1977
    Date of Patent: March 6, 1979
    Inventor: Charles Birnstiel