Granted Patent
Utility
US 5,136,110 · App. 07/626,597
Process for the preparation of bisphenols
Inventors:
Marlin E. Walters, W. Frank Richey, Emmett L. Tasset
Patented Case
View Patent ↗
Granted: Aug 4, 1992
Filed: Dec 12, 1990
Inventors
Marlin E. Walters
W. Frank Richey
Emmett L. Tasset
Assignee (at issue)
THE DOW CHEMICAL 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.