Granted Patent
Utility
US 5,607,513 · App. 08/571,481
Alternating tip run process for pipe cleaning
Inventor:
Peggy L. Sims
Patented Case
View Patent ↗
Granted: Mar 4, 1997
Filed: Dec 13, 1995
Inventor
Peggy L. Sims
Assignee (at issue)
Praxair Technology, 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.