Granted Patent
Utility
US 4,691,897 · App. 06/840,891
Rail lock device for tubular fence
Inventor:
Donald R. Frush
Patented Case
View Patent ↗
Granted: Sep 8, 1987
Filed: Mar 18, 1986
Inventor
Donald R. Frush
Assignee (at issue)
CTB HOLDINGS LLC
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.