Granted Patent
Utility
US 4,835,285 · App. 07/164,662
Processes for preparing substituted 4-hydroxymethyl-1-phenyl-3-pyrazolidinone
Inventors:
Robert J. I. Eubanks, Larry K. Johnson
Patented Case
View Patent ↗
Granted: May 30, 1989
Filed: Mar 7, 1988
Inventors
Robert J. I. Eubanks
Larry K. Johnson
Assignee (at issue)
EASTMAN KODAK 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.