Granted Patent
Utility
US 4,714,530 · App. 06/884,505
Method for producing high purity quaternary ammonium hydroxides
Inventors:
Cecil H. Hale, Alan R. Tanner, Bryan M. Hale
Patented Case
View Patent ↗
Granted: Dec 22, 1987
Filed: Jul 11, 1986
Inventors
Cecil H. Hale
Alan R. Tanner
Bryan M. Hale
Assignee (at issue)
Southwestern Analytical Chemicals, 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.