Granted Patent
Utility
US 4,673,449 · App. 06/742,226
Sealing of a pipe-joint
Inventors:
Stephen F. Webb, Brian J. Merrick
Patented Case
View Patent ↗
Granted: Jun 16, 1987
Filed: Jun 7, 1985
Inventors
Stephen F. Webb
Brian J. Merrick
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.