Granted Patent
Utility
US 4,900,537 · App. 06/940,354
Control of form of crystal precipitation of aluminum hydroxide using cosolvents and varying caustic concentration
Inventor:
Richard B. Wilhelmy
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Dec 11, 1986
Inventor
Richard B. Wilhelmy
Assignee (at issue)
Biotage, Inc.
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.