Granted Patent
Utility
US 4,643,855 · App. 06/612,842
Sealing joints and leaks
Inventors:
Adrian S. Parkes, Gordon J. Corbett, Peter S. Clough, Colin N. H. Barker
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: May 22, 1984
Inventors
Adrian S. Parkes
Gordon J. Corbett
Peter S. Clough
Colin N. H. Barker
Assignee (at issue)
British Gas
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.