Patents by Inventor Akio Shittaka

Akio Shittaka 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).

  • Multi-layered, needle punched, felt-like cushioning material and production method thereof
    Patent number: 4284680
    Abstract: The specification describes a multi-layered, needle-punched, felt-like cushioning material for a hot-pressing machine. The cushioning material is made of at least two fibrous batts and at least one foundation fabric interposed between the batts and needle-punched with the batts. The specification also describes a method for producing the above cushioning material. The cushioning materials according to this invention have a high density and can maintain high elasticity and excellent cushioning properties over a relatively long period of hot-pressing operation.
    Type: Grant
    Filed: January 28, 1980
    Date of Patent: August 18, 1981
    Assignee: Ichikawa Woolen Textile Co., Ltd.
    Inventors: Shunya Awano, Akio Shittaka