Granted Patent
Utility
US 5,439,726 · App. 08/230,813
Bituminous roofing membrane including a lightweight grid and over-under construction
Inventor:
D. Mark Woiceshyn
Patented Case
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Granted: Aug 8, 1995
Filed: Apr 21, 1994
Inventor
D. Mark Woiceshyn
Assignee (at issue)
Bay Mills Ltd
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.