Granted Patent
Utility
US 4,204,639 · App. 05/775,687
Coded label
Inventors:
Donald T. Barber, Thomas C. Scrymgeour
Patented Case
View Patent ↗
Granted: May 27, 1980
Filed: Mar 9, 1977
Inventors
Donald T. Barber
Thomas C. Scrymgeour
Assignee (at issue)
Datafile 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.