Granted Patent
Utility
US 5,175,339 · App. 07/522,622
Process for preparing solid particulate dialkylesters from their corresponding dianhydrides
Inventors:
Eduard P. Babayan, Douglas G. Soden, Anthony Bosch
Patented Case
View Patent ↗
Granted: Dec 29, 1992
Filed: May 14, 1990
Inventors
Eduard P. Babayan
Douglas G. Soden
Anthony Bosch
Assignee (at issue)
The Standard Oil 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.