Patents by Inventor HIROSHIGE MARUYAMA

HIROSHIGE MARUYAMA 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).

  • PROCESS FOR PRODUCING POLYHYDROXYCARBOXYLIC ACID
    Publication number: 20020065388
    Abstract: The present invention provides a process for producing polyhydroxycarboxylic acids which comprises subjecting at least one hydroxycarboxylic acid or oligomer thereof to polycondensation in the presence of an alkali metal compound, an alkaline earth metal compound, or a compound of a metal of Group IIIb of the periodic table. The polyhydroxycarboxylic acids obtained by the process have a weight-average molecular weight of 30,000 or above and are useful as biodegradable plastics for food-wrapping films, drug delivery systems, etc.
    Type: Application
    Filed: December 4, 1997
    Publication date: May 30, 2002
    Inventors: HIROSHIGE MARUYAMA, TOSHIKAZU MURAYAMA, NORIO YANAGISAWA, NOBUKO TSUZAKI