Patents by Inventor Hoang Pho Tu

Hoang Pho Tu 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).

  • Curved tubular packing casing
    Patent number: 4975309
    Abstract: A curved, tubular packing casing of unreinforced cellulose having non-uniform wall thickness in cross-section is disclosed. The area of minimum wall thickness lies opposite the area of maximum wall thickness and is situated in the area of the greater, outer radius of curvature. The maximum wall thickness lies in the range from about 50 to 160 .mu.m, and the minimum wall thickness lies in the range from about 10 to 50 .mu.m. The maximum wall thickness is 50 to 800% greater than the minimum wall thickness.
    Type: Grant
    Filed: April 18, 1989
    Date of Patent: December 4, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Herbert Gord, Hoang Pho Tu, Manfred Siebrecht, Reinhold Becker