Granted Patent
Utility
US 5,136,969 · App. 07/646,152
Modularized machine for reconditioning pipelines
Inventor:
Gordon R. Chapman
Patented Case
View Patent ↗
Granted: Aug 11, 1992
Filed: Jan 25, 1991
Inventor
Gordon R. Chapman
Assignee (at issue)
Cups Unlimited, 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.