Granted Patent
Utility
US 4,375,437 · App. 06/274,703
Method of removing dioxane from phosphate ester surfactants
Inventors:
Michael Katz, Mohamed M. Hashem, Charles P. Talley
Patented Case
View Patent ↗
Granted: Mar 1, 1983
Filed: Jun 16, 1981
Inventors
Michael Katz
Mohamed M. Hashem
Charles P. Talley
Assignee (at issue)
GAF 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.