Granted Patent
Utility
US 4,570,839 · App. 06/687,483
Press
Inventors:
Gordon C. Cox, Peter Shorrock
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Dec 28, 1984
Inventors
Gordon C. Cox
Peter Shorrock
Assignee (at issue)
Leslie Hartridge 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.