Patents by Inventor Hannu Ryynanen

Hannu Ryynanen 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).

  • Disc diffuser
    Patent number: D371187
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: June 25, 1996
    Assignee: Nopon Oy
    Inventor: Hannu Ryynanen
  • Diffuser for water aeration
    Patent number: D386243
    Type: Grant
    Filed: June 12, 1996
    Date of Patent: November 11, 1997
    Assignee: Nopon Oy
    Inventors: Magnus Hasto, Hannu Kahonen, Hannu Ryynanen