Granted Patent
Utility
US 6,247,517 · App. 09/155,006
Roll-up overhead door for sanitary applications
Inventors:
Brian Norbert Drifka, Walenty Kalempa
Patented Case
View Patent ↗
Granted: Jun 19, 2001
Filed: Sep 14, 1998
Inventors
Brian Norbert Drifka
Walenty Kalempa
Assignee (at issue)
Rytec Corporation
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.