Patents by Inventor Rollie H. Dohrn

Rollie H. Dohrn 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).

  • Obturator for large caliber smooth bore ammunition
    Patent number: 6782830
    Abstract: An obturator having redundant surfaces for sealing between a projectile and a gun tube, where the obturator has at least one gun tube side cannelure. At least one projectile side cannelure is located opposite to the at least one gun tube side cannelure, where the at least one gun tube side cannelure is conformed to seal around the projectile. A tail protrudes from a rearward end of the at least one gun tube side cannelure, where the tail makes an interference fit with the smooth gun bore to make a low pressure seal.
    Type: Grant
    Filed: September 11, 2003
    Date of Patent: August 31, 2004
    Assignee: Alliant Techsystems Inc.
    Inventors: Calvin T. Candland, Dipak S. Kamdar, Rollie H. Dohrn