Granted Patent
Utility
US 4,112,178 · App. 05/815,633
Aqueous polyurethane undercoats
Inventor:
Albert E. Brown
Patented Case
View Patent ↗
Granted: Sep 5, 1978
Filed: Jul 14, 1977
Inventor
Albert E. Brown
Assignee (at issue)
Columbia Ribbon & Carbon Mfg. Co., 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.