Granted Patent
Utility
US 4,384,592 · App. 06/212,666
Low-noise valve trim
Inventor:
Kam W. Ng
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Nov 28, 1980
Inventor
Kam W. Ng
Assignee (at issue)
International Telephone and Telegraph Corporation
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.