Granted Patent
Utility
US 4,939,236 · App. 07/404,811
Process for preparation of copoly(arylene sulfide)
Inventors:
David R. Fagerburg, Joseph J. Watkins, Paul B. Lawrence, Mark Rule
Patented Case
View Patent ↗
Granted: Jul 3, 1990
Filed: Sep 8, 1989
Inventors
David R. Fagerburg
Joseph J. Watkins
Paul B. Lawrence
Mark Rule
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.