Granted Patent
Utility
US 5,464,908 · App. 08/128,318
Process for preparing water-soluble polymers
Inventors:
Shin Sato, Kiyoji Kuma
Patented Case
View Patent ↗
Granted: Nov 7, 1995
Filed: Sep 29, 1993
Inventors
Shin Sato
Kiyoji Kuma
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.