Patents by Inventor Tsutomu Ito

Tsutomu Ito 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 the production of acrylic acid or methacrylic acid
    Patent number: 4677225
    Abstract: A process for producing acrylic acid or methacrylic acid by reacting acetic acid or propionic acid with formaldehyde in a gas phase is described, characterized by carrying out the reaction in the presence of a solid catalyst containing at least one of boron oxide or phosphorus oxide and having an acid site of an acid strength, pKa.ltoreq.-3.0. The solid catalyst is of high activity and is satisfactory in both selectivity and conversion and, furthermore, its high selectivity can be maintained for long periods of time. Thus the desired product, acrylic acid or methacrylic acid, can be produced in high yield.
    Type: Grant
    Filed: May 21, 1985
    Date of Patent: June 30, 1987
    Assignee: Toagosei Chemical Industry Co., Ltd.
    Inventors: Hiroshi Niizuma, Toshiro Miki, Shiro Kojima, Kishiro Azuma, Hiroyuki Kato, Yuichi Murakami, Tsutomu Ito