Granted Patent
Utility
US 4,576,621 · App. 06/689,425
Apparatus for producing chopped strands of glass fibers
Inventors:
Robert N. Chappelear, Alex P. Symborski
Patented Case
View Patent ↗
Granted: Mar 18, 1986
Filed: Jan 7, 1985
Inventors
Robert N. Chappelear
Alex P. Symborski
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.