Granted Patent
Utility
US 6,120,913 · App. 09/065,259
Bituminous composition for shingles
Inventors:
Robert Q. Kluttz, Gerardus Wilhelmus Jozef Heimerikx
Patented Case
View Patent ↗
Granted: Sep 19, 2000
Filed: Apr 23, 1998
Inventors
Robert Q. Kluttz
Gerardus Wilhelmus Jozef Heimerikx
Assignee (at issue)
SHELL OIL COMPANY
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.