Granted Patent
Utility
US 4,789,706 · App. 07/171,947
Narrow molecular weight polyester oligomers and method of preparation
Inventor:
Roy C. Williams
Patented Case
View Patent ↗
Granted: Dec 6, 1988
Filed: Mar 23, 1988
Inventor
Roy C. Williams
Assignee (at issue)
NL Chemicals, Inc.
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.