Patents by Inventor Lewis Smith

Lewis Smith 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).

  • Piston valve
    Patent number: 4011889
    Abstract: A valve having separate closures for its inlet and its outlet respectively comprises a housing having the inlet in an elongated tubular wall and the outlet at an annular valve seat. A piston constituting one closure is movable coaxially within said wall so as to open and close the outlet. A sleeve constituting another closure is movable coaxially over the piston and within said wall so as to open and close the inlet. The piston and the sleeve are associated for interdependent movement.
    Type: Grant
    Filed: December 11, 1975
    Date of Patent: March 15, 1977
    Assignee: Chemetron Corporation
    Inventor: Robert Lewis Smith
  • Method of removing toxic substances from the intestinal tract by the use of a surfactant and a sorbent
    Patent number: 3934007
    Abstract: Method of removing metabolic waste products from a warm-blooded animal by orally administering a composition of a non-toxic surfactant and pharmaceutically acceptable sorbents.The compositions are useful in treating chronic and acute uremia, hepatic failure due to cirrhosis or other causes, acute renal failure such as from drug poisonings and other conditions requiring removal of toxic substances in which oral drug administration is feasible.
    Type: Grant
    Filed: March 27, 1974
    Date of Patent: January 20, 1976
    Assignee: American Cyanamid Company
    Inventors: Robert Zalmon Gussin, Lewis Smith Meriwether