Granted Patent
Utility
US 4,906,698 · App. 07/329,279
Process for producing crosslinked polymer particles
Inventors:
Hiroshi Kusano, Hideaki Kiniwa, Akihiro Shimura, Masahiko Annaka
Patented Case
View Patent ↗
Granted: Mar 6, 1990
Filed: Mar 27, 1989
Inventors
Hiroshi Kusano
Hideaki Kiniwa
Akihiro Shimura
Masahiko Annaka
Assignee (at issue)
Mitsubishi Kasei 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.