Patents by Inventor Steven B. Yntema

Steven B. Yntema 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).

  • Lead free frangible iron bullets
    Patent number: 11674781
    Abstract: The invention relates to bullets having increased frangibility (or which can be easily fragmented) and to powder materials and processes for the manufacture of such bullets. The bullets of the present invention are made from an iron alloy containing 75-81% Hoeganaes MH-100 Iron 0.6-0.09% Carbon, and balance of admixed Copper powder. Said bullets are then coated for lubricity so the bullet does not prematurely wear the barrel of a gun. Additionally, the invention provides a simple low cost process to make bullets that is amenable to mass production via automation.
    Type: Grant
    Filed: January 31, 2020
    Date of Patent: June 13, 2023
    Assignee: TPI Powder Metallurgy, Inc.
    Inventors: Stuart Yntema, Steven B. Yntema, Ted R. Easlick, David J. May
  • LEAD FREE FRANGIBLE IRON BULLETS
    Publication number: 20200225011
    Abstract: The invention relates to bullets having increased frangibility (or which can be easily fragmented) and to powder materials and processes for the manufacture of such bullets. The bullets of the present invention are made from an iron alloy containing 75-81% Hoeganaes MH-100 Iron 0.6-0.09% Carbon, and balance of admixed Copper powder. Said bullets are then coated for lubricity so the bullet does not prematurely wear the barrel of a gun. Additionally, the invention provides a simple low cost process to make bullets that is amenable to mass production via automation.
    Type: Application
    Filed: January 31, 2020
    Publication date: July 16, 2020
    Applicant: TPI Powder Metallurgy, Inc.
    Inventors: Philip H. Sheridan, Stuart H. Yntema, Ted R. Easlick, Steven B. Yntema, Stuart Yntema
  • LEAD FREE FRANGIBLE IRON BULLETS
    Publication number: 20160091290
    Abstract: The invention relates to sintered iron bullets having increased frangibility (or which can be easily fragmented) and to the materials and processes for the manufacture of such bullets. The bullets of the present invention are typically made from iron powder (including powdered iron from scrap iron) which are pressed to form a briquette and then sintered under conditions so as to obtain bullets with the desired level of frangibility. In the preferred embodiment of the invention, the bullets are resin or plastic impregnated and then coated to facilitate lubricity and prevent corrosion.
    Type: Application
    Filed: September 29, 2015
    Publication date: March 31, 2016
    Applicant: PM BALLISTICS LLC
    Inventors: Philip H. Sheridan, Stuart H. Yntema, Ted R. Easlick, Steven B. Yntema, Stuart Yntema