Patents by Inventor Roger O. Lefrant

Roger O. Lefrant 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).

  • Closing cover for a metal container
    Patent number: 4821911
    Abstract: An airtight closing cover is produced which can be reused many times, is deformable, is corrosion-resistant and is easily accessible to the point of a screwdriver, by covering a metal ring 7 with a sheath 15 in a resilient synthetic material and a peripheral shoulder 16 which, in the closed position, is crushed by the cover (9) against a folded back rim (13) of the ring (7) and therefore comprises a barrier to possible corrosive vapors. (FIG. 1).
    Type: Grant
    Filed: September 2, 1987
    Date of Patent: April 18, 1989
    Assignee: Manufacture de Bidons et Boites Metalliques M. Kouperman S.A.
    Inventor: Roger O. Lefrant