Granted Patent
Utility
US 6,299,974 · App. 09/398,149
Stain blocking barrier layer
Inventors:
Keith S. Shih, Hao A. Chen
Patented Case
View Patent ↗
Granted: Oct 9, 2001
Filed: Sep 17, 1999
Inventors
Keith S. Shih
Hao A. Chen
Assignee (at issue)
Mannington Mills, of Delaware, 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.