Granted Patent
Utility
US 4,523,955 · App. 06/606,315
Hydrous calcium silicate insulation products manufactured by recycling greenware
Inventor:
Jerry L. Helser
Patented Case
View Patent ↗
Granted: Jun 18, 1985
Filed: May 2, 1984
Inventor
Jerry L. Helser
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.