Granted Patent
Utility
US 5,183,514 · App. 07/677,927
Process for dissolving or removing rigid polyurethane foam by contacting with 1,2-dimethyl imidazole
Inventors:
Edward T. Marquis, George P. Speranza, Wei-Yang Su
Patented Case
View Patent ↗
Granted: Feb 2, 1993
Filed: Apr 1, 1991
Inventors
Edward T. Marquis
George P. Speranza
Wei-Yang Su
Assignee (at issue)
Texaco Chemical 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.