Granted Patent
Utility
US 4,908,271 · App. 07/212,577
Capsule-shaped polymer particles and process for the production thereof
Inventors:
Kiyoshi Kasai, Masayuki Hattori, Hiromi Takeuchi, Nobuo Sakurai
Patented Case
View Patent ↗
Granted: Mar 13, 1990
Filed: Jun 28, 1988
Inventors
Kiyoshi Kasai
Masayuki Hattori
Hiromi Takeuchi
Nobuo Sakurai
Assignee (at issue)
Japan Synthetic Rubber Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.