Granted Patent
Utility
US 4,354,889 · App. 06/233,309
Ink reservoir element for use in a marking instrument, and method and apparatus for producing same
Inventor:
Richard M. Berger
Patented Case
View Patent ↗
Granted: Oct 19, 1982
Filed: Feb 11, 1981
Inventor
Richard M. Berger
Assignee (at issue)
American Filtrona Corporation
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.