Granted Patent
Utility
US 6,213,721 · App. 08/685,936
Noise emission reduction
Inventor:
Peter WATKINSON
Patented Case
View Patent ↗
Granted: Apr 10, 2001
Filed: Jul 22, 1996
Inventor
Peter WATKINSON
Assignee (at issue)
Thomson Marconi Sonar Limited
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.