Patents by Inventor John K. Langsdon, Jr.

John K. Langsdon, Jr. 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).

  • Safety device for crossing railroads
    Patent number: 4262771
    Abstract: An hydraulically operated bucket for lifting persons over railroad cars.
    Type: Grant
    Filed: February 5, 1979
    Date of Patent: April 21, 1981
    Inventor: John K. Langsdon, Jr.