Granted Patent
Utility
US 5,723,691 · App. 08/522,187
Method for preparing ion-exchange resin for use as a catalyst in the synthesis of bisphenols
Inventors:
Michael J. Cipullo, Eric James Pressman
Patented Case
View Patent ↗
Granted: Mar 3, 1998
Filed: Aug 31, 1995
Inventors
Michael J. Cipullo
Eric James Pressman
Assignee (at issue)
General Electric 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.