Granted Patent
Utility
US 4,845,270 · App. 07/173,408
Propanone 1,3-disulfonic acid as an esterification catalyst
Inventor:
Stanley R. Sandler
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Mar 25, 1988
Inventor
Stanley R. Sandler
Assignee (at issue)
Pennwalt 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.