Granted Patent
Utility
US 4,951,442 · App. 07/401,111
Method for constructing fire-stop collar assembly
Inventor:
Gerald R. Harbeke, Jr.
Patented Case
View Patent ↗
Granted: Aug 28, 1990
Filed: Aug 31, 1989
Inventor
Gerald R. Harbeke, Jr.
Assignee (at issue)
MSP Products, 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.