Granted Patent
Utility
US 4,978,488 · App. 07/479,235
Concrete block molding machine having continuously driven vibrating shaft mechanism which can be programmably vibrated and method of programmably vibrating such machines
Inventor:
Mark Wallace
Patented Case
View Patent ↗
Granted: Dec 18, 1990
Filed: Feb 12, 1990
Inventor
Mark Wallace
Assignee (at issue)
BESSER COMPANY
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.