Granted Patent
Utility
US 4,770,103 · App. 06/848,346
Method and apparatus for exchanging railway cross ties with rail clamping mechanism to prevent rail flexure
Inventor:
Franz Allmer
Patented Case
View Patent ↗
Granted: Sep 13, 1988
Filed: Apr 4, 1986
Inventor
Franz Allmer
Assignee (at issue)
Canron Corporation
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.