Granted Patent
Utility
US 6,648,562 · App. 09/877,318
Apparatus for tapping a hole in a pipeline
Inventors:
Charles D. Calkins, Jerry Lee Dunn, David Albertson, Richard L. Goswick, Matthew W. James
Patented Case
View Patent ↗
Granted: Nov 18, 2003
Filed: Jun 8, 2001
Inventors
Charles D. Calkins
Jerry Lee Dunn
David Albertson
Richard L. Goswick
Matthew W. James
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.