Granted Patent
Utility
US 4,980,112 · App. 07/211,050
Method for rotational molding
Inventor:
William E. Masters
Patented Case
View Patent ↗
Granted: Dec 25, 1990
Filed: Jun 24, 1988
Inventor
William E. Masters
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.