Granted Patent
Utility
US 6,233,894 · App. 09/223,335
Guardrail system for an apparatus movable along a roof structure
Inventors:
Ernest Craig Abney, Don Albert Neifer, Dennis K. Wenrick, Clinton A. Plant
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Dec 30, 1998
Inventors
Ernest Craig Abney
Don Albert Neifer
Dennis K. Wenrick
Clinton A. Plant
Assignee (at issue)
Owens-Corning Fiberglas Technology, Inc.
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.