Patents by Inventor Ryouzo Sugawara

Ryouzo Sugawara 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: 5002847
    Abstract: A toner for developing electrostatic images and a process for producing the same is disclosed. The process comprises after applying ultrasonic waves to raw materials-mixture comprising addition polymerizable monomer(s), coloring agent(s) and water as indispensable components in the course of charging the raw materials-mixture into a reaction vessel or to a raw materials-mixture in a reaction vessel, at an application amount of from 0.05 to 50 W/l/hr. per unit treating volume and time using an ultrasonic homogenizer having frequencies of from 10 kHz to 50 kHz, subjecting the raw materials-mixture to suspension polymerization.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: March 26, 1991
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Hiroshi Utsumi, Kinji Shinzo, Kazuya Kuriyama, Ryouzo Sugawara, Masanobu Fukuda, Shunichi Hiraishi