Granted Patent
Utility
US 4,418,679 · App. 06/156,672
Ceramic wall spacer kit
Inventor:
Roy N. Grayson
Patented Case
View Patent ↗
Granted: Dec 6, 1983
Filed: Jun 5, 1980
Inventor
Roy N. Grayson
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.