Granted Patent
Utility
US 4,928,736 · App. 07/225,926
Pipeline casing insulator
Inventor:
Larry C. Muszynski
Patented Case
View Patent ↗
Granted: May 29, 1990
Filed: Jul 29, 1988
Inventor
Larry C. Muszynski
Assignee (at issue)
Lone Star Industries, 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.