Granted Patent
Utility
US 4,479,732 · App. 06/394,987
Writing instrument with sealing cap retained in tip
Inventor:
Kazuo Shimizu
Patented Case
View Patent ↗
Granted: Oct 30, 1984
Filed: Jul 2, 1982
Inventor
Kazuo Shimizu
Assignee (at issue)
Ancos Co., Ltd.
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.