Granted Patent
Utility
US 4,162,155 · App. 05/772,139
Compositions
Inventor:
David W. Young
Patented Case
View Patent ↗
Granted: Jul 24, 1979
Filed: Feb 25, 1977
Inventor
David W. Young
Assignee (at issue)
Howard Hall & Company
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.