Patents by Inventor Michael P. Donohoe

Michael P. Donohoe 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).

  • Elevator rotary door interlock
    Patent number: 5207298
    Abstract: An elevator door interlock has a camming surface which is in contact with a lead of an electrical circuit and has a bridge thereon. The camming surface rotates the bridge into contact with the lead if a hoistway door is locked and out of contact with the lead if the hoistway door is not locked.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: May 4, 1993
    Assignee: Otis Elevator Company
    Inventors: Michael P. Donohoe, Richard E. Kulak, Christian G. Tonna
  • Elevator rotary lost door interlock
    Patent number: 5203431
    Abstract: An elevator door interlock has a camming surface which is in contact with a lead of an electrical circuit during normal operation and has a bridge thereon. The interlock rotates the camming surface along the lead to contact the bridge if an elevator door is locked, to not contact the lead if the elevator door is not locked, and to rotate the camming surface out of contact with the leads if the door is missing.
    Type: Grant
    Filed: February 25, 1992
    Date of Patent: April 20, 1993
    Assignee: Otis Elevator Company
    Inventors: Michael P. Donohoe, Richard E. Kulak, Christian G. Tonna