Granted Patent
Utility
US 4,539,574 · App. 06/538,863
Pen capping mechanism
Inventors:
Lloyd N. Broome, James Lawrence
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Oct 4, 1983
Inventors
Lloyd N. Broome
James Lawrence
Assignee (at issue)
Sanders GmbH
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.