Granted Patent
Utility
US 4,522,203 · App. 06/588,037
Water impervious materials
Inventor:
Alfred T. Mays
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: Mar 9, 1984
Inventor
Alfred T. Mays
Assignee (at issue)
Chicopee
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.