Granted Patent
Utility
US 6,109,829 · App. 09/043,592
Pipeline pigging
Inventor:
John Duncan Cruickshank
Patented Case
View Patent ↗
Granted: Aug 29, 2000
Filed: Aug 20, 1998
Inventor
John Duncan Cruickshank
Assignee (at issue)
Coflexip Stena Offshore Limited
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.