Granted Patent
Utility
US 4,292,139 · App. 06/202,126
Method for inhibiting deposit formation in distillation units associated with separation and purification of alkyl phosphorochloridothioates
Inventor:
Ellis B. Rifkin
Patented Case
View Patent ↗
Granted: Sep 29, 1981
Filed: Oct 30, 1980
Inventor
Ellis B. Rifkin
Assignee (at issue)
Ethyl 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.