Patents by Inventor Masayasu Mizutani

Masayasu Mizutani 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).

  • Patent number: 4018230
    Abstract: A cervical dilator is formed of a mushroom shaped elastic sack having inelastic members embedded therein configured to maintain the general shape and limit the size of the sack during expansion under internal pressure.The dilator is inserted with the head portion folded and fluid is introduced to unfold it and expand it.
    Type: Grant
    Filed: April 2, 1975
    Date of Patent: April 19, 1977
    Inventors: Kazuo Ochiai, Masayasu Mizutani