Granted Patent
Utility
US 4,242,892 · App. 06/033,451
Laying head with segmented laying pipe
Inventors:
Robert D. Wykes, Harold E. Woodrow
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Apr 26, 1979
Inventors
Robert D. Wykes
Harold E. Woodrow
Assignee (at issue)
Morgan Construction Company
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.