Granted Patent
Utility
US 4,382,637 · App. 06/124,534
Weight transfer roller apparatus
Inventors:
Robert Blackburn, Ian Blackburn
Patented Case
View Patent ↗
Granted: May 10, 1983
Filed: Feb 25, 1980
Inventors
Robert Blackburn
Ian Blackburn
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.