Granted Patent
Utility
US 6,751,897 · App. 10/054,332
Lip assembly
Inventor:
Robert S. Bierwith
Patented Case
View Patent ↗
Granted: Jun 22, 2004
Filed: Nov 13, 2001
Inventor
Robert S. Bierwith
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.