Granted Patent
Utility
US 4,907,321 · App. 07/304,165
Enhanced color change interlocking closure strip
Inventor:
John W. Williams
Patented Case
View Patent ↗
Granted: Mar 13, 1990
Filed: Jan 31, 1989
Inventor
John W. Williams
Assignee (at issue)
First Brands 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.