Granted Patent
Utility
US 4,408,058 · App. 06/382,316
Preparation of ortho-sulfobenzoic acid anhydride by catalyzed thermolysis
Inventors:
Mark L. Mitchell, III, Richard P. Carr
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: May 26, 1982
Inventors
Mark L. Mitchell, III
Richard P. Carr
Assignee (at issue)
The Sherwin-Williams Company
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.