Patents by Inventor Antonio Pinheiro

Antonio Pinheiro 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).

  • Ring binder
    Patent number: 5135323
    Abstract: A locking ring binder assembly has a resilient sheet metal cover and a pair of operating levers rotatably mounted on the covers. A projection on the operating levers beneath the cover and a leg portion on the operating levers in alignment with the projection through a thickness of the cover locks the binder in a closed position even though the operating levers are not rotated to an over center position.
    Type: Grant
    Filed: July 23, 1991
    Date of Patent: August 4, 1992
    Assignee: U.S. Ring Binder
    Inventor: Antonio Pinheiro