Granted Patent
Utility
US 6,305,429 · App. 09/284,468
Double walled pipe structures
Inventors:
Stuart Welch, Russell Dearden, Russell Codling, Paul Summerfield
Patented Case
View Patent ↗
Granted: Oct 23, 2001
Filed: Jul 8, 1999
Inventors
Stuart Welch
Russell Dearden
Russell Codling
Paul Summerfield
Assignee (at issue)
Corus UK 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.