Patents by Inventor Yukihiro Nagagawa

Yukihiro Nagagawa 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).

  • Spacing ring for tubes in high temperature environment
    Patent number: 5056832
    Abstract: A spacing ring for placement between a radially inwardly facing annular surface on a first member and a radially outwardly facing annular surface on a second member to maintain the first and second members in predetermined radially spaced relationship. The ring consists of a plurality of matted threads formed into an annular configuration. The ring has a radially inwardly facing surface to surroundingly engage the radially outwardly facing annular surface on the second member and a radially outwardly facing surface to be surroundingly engaged by the inwardly facing annular surface of the first member with the radially inwardly facing annular surface on the first member and the radially outwardly facing annular surface on the second member in axially overlapping relationship. The invention also contemplates a method of forming the spacing ring. The wool material is wrapped around an annular surface ona core bar.
    Type: Grant
    Filed: December 1, 1989
    Date of Patent: October 15, 1991
    Inventors: Yukihiro Nagagawa, Alan L. Brittingham