Granted Patent
Utility
US 4,337,033 · App. 06/222,055
Apparatus for curing masonry units
Inventor:
Bob R. Drain
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: Jan 2, 1981
Inventor
Bob R. Drain
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.