Patents by Inventor Joseph P. Mahon

Joseph P. Mahon 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).

  • Between landing car door safety lock
    Patent number: 4357998
    Abstract: Between floors or landings the elevator car door may be opened allowing passengers to open the hall door. To prevent this from occurring, a stop apparatus is attached to the car door and hall door. This apparatus allows the car door to only be opened to a certain minimum acceptable distance when the car is above a predetermined distance above the landing.
    Type: Grant
    Filed: October 6, 1981
    Date of Patent: November 9, 1982
    Assignee: Otis Elevator Company
    Inventors: George W. Gibson, Joseph P. Mahon, John McAulay, Stanley M. Wolper