Patents by Inventor Robert Estrella

Robert Estrella 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 control apparatus
    Patent number: 4674603
    Abstract: Elevator control apparatus comprising a sensing head containing a plurality of position responsive switches usable for elevator control. A tape guide is supported from the sensing head housing and includes separate guide members oppositely disposed at opposite sides of the sensing head housing along with screws for securing the oppositely disposed guide members to either side of the housing. Each guide member has a slot for receiving one side of the rigid tape.
    Type: Grant
    Filed: January 28, 1985
    Date of Patent: June 23, 1987
    Inventor: Robert Estrella