Patents by Inventor David F. Berry

David F. Berry 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).

  • Infiltrated powder metal part and method for making same
    Patent number: 4976778
    Abstract: The present invention relates to an infiltrated ferrous powder metal part containing certain additives, yielding a part having improved dimensional control during infiltration and uniform and predictable distribution of dynamic properties within a given group of commonly manufactured parts.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: December 11, 1990
    Assignee: SCM Metal Products, Inc.
    Inventors: David F. Berry, Erhard Klar, Mark Svilar
  • Process for preparing powder metal parts with dynamic properties
    Patent number: 4921665
    Abstract: The present invention relates to porous powder metal (P/M) parts having improved dynamic properties such as impact and fatigue strength. These properties are achieved by the use of finer metal powders.
    Type: Grant
    Filed: March 11, 1988
    Date of Patent: May 1, 1990
    Assignee: SCM Metal Products, Inc.
    Inventors: Erhard Klar, Mark Svilar, David F. Berry
  • Infiltrated powder metal part having improved impact strength tensile strength and dimensional control and method for making same
    Patent number: 4861373
    Abstract: The present invention relates to an infiltrated ferrous powder metal part containing certain additives, yielding a radically improved unnotched impact strength without sacrificing tensile strength. Fatigue strength is also improved. In addition, improved dimensional control is obtained during infiltration. The microstructure is also improved, with smoothing or rounding of the formerly sharp angled copper filled pores. The invention also comprises the method of achieving these results.
    Type: Grant
    Filed: March 8, 1988
    Date of Patent: August 29, 1989
    Assignee: SCM Metal Products, Inc.
    Inventors: Erhard Klar, Mark Svilar, David F. Berry