Granted Patent
Utility
US 4,548,650 · App. 06/522,871
Diatomite-modified asphalt membranes and slurry seals
Inventor:
John H. Kietzman
Patented Case
View Patent ↗
Granted: Oct 22, 1985
Filed: Aug 12, 1983
Inventor
John H. Kietzman
Assignee (at issue)
Manville Service 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.