Patents by Inventor Chaman Lall

Chaman Lall 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).

  • High strength powder metal parts
    Patent number: 4614544
    Abstract: A high strength powder metal part formed from an alloy of iron, nickel, molybdenum and carbon and having an ultimate tensile strength of at least 175,000 pounds per square inch. The powder metal part is made by mixing the alloy with a lubricant, forming the mixture into the desired part shape, sintering in a dissociated ammonia atmosphere, and cryogenically cooling the sintered part.
    Type: Grant
    Filed: October 22, 1985
    Date of Patent: September 30, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Chaman Lall
  • Dimensionally stable powder metal compositions
    Patent number: 4612048
    Abstract: Powder metal compositions of nickel, molybdenum, boron, carbon, phosphorus and iron which exhibit low shrinkage on sintering.
    Type: Grant
    Filed: July 15, 1985
    Date of Patent: September 16, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Randall M. German, Chaman Lall, Deepak S. Madan