Granted Patent
Utility
US 4,853,419 · App. 07/178,942
Distilled products of polyethylene terephthalate polymers and polycarboxylic acid-containing polyols and polymeric foams obtained therefrom
Inventors:
Richard K. Hallmark, Ernest K. Moss
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Apr 7, 1988
Inventors
Richard K. Hallmark
Ernest K. Moss
Assignee (at issue)
Sloss Industries Corporation
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.