Granted Patent
Utility
US 6,468,632 · App. 09/731,332
Method of edge-sealing gypsum board for clean room quality
Inventor:
Daniel A. Winkowski
Patented Case
View Patent ↗
Granted: Oct 22, 2002
Filed: Dec 6, 2000
Inventor
Daniel A. Winkowski
Assignee (at issue)
National Gypsum Properties, LLC
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.