Granted Patent
Utility
US 4,228,310 · App. 06/021,517
Polyol preparation
Inventors:
George P. Speranza, Robert L. Zimmerman, Thomas Howard Austin
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Mar 19, 1979
Inventors
George P. Speranza
Robert L. Zimmerman
Thomas Howard Austin
Assignee (at issue)
Texaco Development 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.