Granted Patent
Utility
US 4,378,608 · App. 06/210,607
Apparatus for covering a liquid basin, and roller-blind type cover for use therein
Inventor:
Engbert J. Duintjer
Patented Case
View Patent ↗
Granted: Apr 5, 1983
Filed: Nov 26, 1980
Inventor
Engbert J. Duintjer
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.