Granted Patent
Utility
US 4,195,010 · App. 05/813,359
Ceramic coated quartz particles
Inventors:
Alexander H. Russell, John L. McClinton
Patented Case
View Patent ↗
Granted: Mar 25, 1980
Filed: Jul 6, 1977
Inventors
Alexander H. Russell
John L. McClinton
Assignee (at issue)
The Burns & Russell Company of Baltimore City
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.