Granted Patent
Utility
US 4,883,536 · App. 07/229,379
Suspension of water-soluble polymers in aqueous media containing dissolved salts
Inventor:
Charles L. Burdick
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Aug 5, 1988
Inventor
Charles L. Burdick
Assignee (at issue)
Aqualon 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.