Granted Patent
Utility
US 4,658,730 · App. 06/882,011
Railroad correction apparatus
Inventors:
Helmuth von Beckmann, Edwin H. Reeves
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Jul 3, 1986
Inventors
Helmuth von Beckmann
Edwin H. Reeves
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.