Granted Patent
Utility
US 4,790,486 · App. 06/926,707
Process for preparation of paper-making hydrous silicic acid filler
Inventors:
Shigeru Eimaeda, Kunihiko Aida, Shinji Seto, Takao Suzuki
Patented Case
View Patent ↗
Granted: Dec 13, 1988
Filed: Oct 31, 1986
Inventors
Shigeru Eimaeda
Kunihiko Aida
Shinji Seto
Takao Suzuki
Assignee (at issue)
Oji Paper Co., Ltd.
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.