Granted Patent
Utility
US 4,272,272 · App. 06/074,357
Method and apparatus for production of mineral fibers
Inventor:
Lawrence J. Grubka
Patented Case
View Patent ↗
Granted: Jun 9, 1981
Filed: Sep 10, 1979
Inventor
Lawrence J. Grubka
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.