Granted Patent
Utility
US 6,089,304 · App. 09/101,310
Compact track system with rear mount counterbalance system for sectional doors
Inventors:
Willis Jay Mullet, Derek S. Paquette
Patented Case
View Patent ↗
Granted: Jul 18, 2000
Filed: Jul 2, 1998
Inventors
Willis Jay Mullet
Derek S. Paquette
Assignee (at issue)
Wayne-Dalton 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.