Granted Patent
Utility
US 4,557,883 · App. 06/345,954
Preparation and expansion of perlite ore fines
Inventors:
Jerome C. Shiuh, Mario P. Tocci
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Feb 5, 1982
Inventors
Jerome C. Shiuh
Mario P. Tocci
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.