IP Library › Granted Patent US 6,334,441
Granted Patent Utility
US 6,334,441 · App. 09/197,669

Phonation valve for breathing tube

Inventors: John Zowtiak, Thomas Young, Tony Wondka
Patented Case View Patent ↗
Granted: Jan 1, 2002 Filed: Nov 23, 1998
Inventors
John Zowtiak
Thomas Young
Tony Wondka
Assignee (at issue)
MallincKrodt Medical, 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.

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Quick Facts
Patent No.
US 6,334,441
App. No.
09/197,669
Filed
1998-11-23
Granted
2002-01-01
Kind
B1