Granted Patent
Utility
US 6,341,462 · App. 09/227,473
Roofing material
Inventors:
Matti Kiik, Dan LaVietes, Michael L. Bryson, Timothy H. Lock
Patented Case
View Patent ↗
Granted: Jan 29, 2002
Filed: Jan 8, 1999
Inventors
Matti Kiik
Dan LaVietes
Michael L. Bryson
Timothy H. Lock
Assignee (at issue)
Elk Corporation of Dallas
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.