Granted Patent
Utility
US 5,390,465 · App. 08/116,719
Passthrough device with firestop
Inventor:
James A. Rajecki
Patented Case
View Patent ↗
Granted: Feb 21, 1995
Filed: Sep 3, 1993
Inventor
James A. Rajecki
Assignee (at issue)
The Lamson & Sessions Co.
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.