Granted Patent
Utility
US 4,758,602 · App. 07/105,624
Polyols from tall oil and aromatic polyester polyols
Inventor:
John M. Trowell
Patented Case
View Patent ↗
Granted: Jul 19, 1988
Filed: Oct 5, 1987
Inventor
John M. Trowell
Assignee (at issue)
HERCULES LLC
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.