Granted Patent
Utility
US 6,231,213 · App. 09/358,378
Door frame for lensed troffer
Inventors:
Peter M. Schmidt, Roger Erle Norris, John T. Mayfield, III
Patented Case
View Patent ↗
Granted: May 15, 2001
Filed: Jul 21, 1999
Inventors
Peter M. Schmidt
Roger Erle Norris
John T. Mayfield, III
Assignee (at issue)
NSI Enterprises, Inc.
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.