Granted Patent
Utility
US 4,227,932 · App. 06/013,107
Single component potassium silicate cement for dry gunning
Inventors:
George R. Leah, Robert R. Pierce
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Feb 21, 1979
Inventors
George R. Leah
Robert R. Pierce
Assignee (at issue)
Pennwalt Corporation
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.