Patents by Inventor Boter Tsai

Boter Tsai 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).

  • Contractible handcuff
    Patent number: 5099662
    Abstract: A contractible handcuff with a switch on its body to control a motor in the body for normal or reverse rotation in order to extend or retract a handcuff which is designed with a plurality of slots, a chain and a hook operating in a manner that the handcuff can bend and bind any substance it touches immediately by nature of its structure, a slightly curved flexible metal tape, and the hook can lock such substance in place.
    Type: Grant
    Filed: January 3, 1991
    Date of Patent: March 31, 1992
    Inventor: Boter Tsai