Granted Patent
Utility
US 4,347,155 · App. 06/245,421
Energy efficient perlite expansion process
Inventor:
Kenneth L. Jenkins
Patented Case
View Patent ↗
Granted: Aug 31, 1982
Filed: Mar 19, 1981
Inventor
Kenneth L. Jenkins
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.