Granted Patent
Utility
US 4,307,621 · App. 06/107,570
Swing drive assembly for machines having rotatable frames
Inventor:
Thomas S. Merron
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Dec 27, 1979
Inventor
Thomas S. Merron
Assignee (at issue)
Dresser Industries, Inc.
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.