Granted Patent
Utility
US 3,968,738 · App. 05/571,060
Plastic louver frame assembly
Inventor:
William A. Matzke
Patented Case
View Patent ↗
Granted: Jul 13, 1976
Filed: Apr 24, 1975
Inventor
William A. Matzke
Assignee (at issue)
Champion International Corporation Limited
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.