Granted Patent
Utility
US 4,286,967 · App. 06/163,848
Double crystallization process to produce low organic, low silica soda ash
Inventors:
Elwood F. Booth, Jr., Rustom P. Poncha
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Jun 27, 1980
Inventors
Elwood F. Booth, Jr.
Rustom P. Poncha
Assignee (at issue)
Allied Chemical 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.