Patents by Inventor Charles Helfman

Charles Helfman 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).

  • Building structure
    Patent number: 4376353
    Abstract: Composite wood and metal building structure including a metal angle iron frame having an integral latch strike and dead bolt recess therein and a wood door hingedly secured within the frame for installation together therewith in a building opening, with one leg of the angle iron frame extending transversely of the door about the edges thereof and with the other leg of the angle iron door frame extending substantially in the plane of the door about the periphery of a building structure opening.
    Type: Grant
    Filed: November 5, 1980
    Date of Patent: March 15, 1983
    Inventor: Charles Helfman