Granted Patent
Utility
US 4,525,527 · App. 06/460,037
Production process for highly water absorbable polymer
Inventors:
Hisao Takeda, Yasunori Taniguchi
Patented Case
View Patent ↗
Granted: Jun 25, 1985
Filed: Jan 21, 1983
Inventors
Hisao Takeda
Yasunori Taniguchi
Assignee (at issue)
American Colloid Company
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.