Granted Patent
Utility
US 4,366,921 · App. 06/305,917
Child-resistant closure device
Inventor:
Donald C. Kirk, Jr.
Patented Case
View Patent ↗
Granted: Jan 4, 1983
Filed: Sep 28, 1981
Inventor
Donald C. Kirk, Jr.
Assignee (at issue)
Ethyl Products Company
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.