Granted Patent
Utility
US 4,967,663 · App. 07/261,342
Unengraved metering roll of porous ceramic
Inventor:
Robert L. Metcalf
Patented Case
View Patent ↗
Granted: Nov 6, 1990
Filed: Oct 24, 1988
Inventor
Robert L. Metcalf
Assignee (at issue)
Coors Porcelain 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.