Granted Patent
Utility
US 4,897,429 · App. 07/329,131
Aromatic polyester polyols from dimethyl terephthalate process residue and tall oil fatty acids
Inventors:
John M. Trowell, Scott F. Lange
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Mar 27, 1989
Inventors
John M. Trowell
Scott F. Lange
Assignee (at issue)
CAPE Industries, 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.