Granted Patent
Utility
US 4,335,852 · App. 06/145,798
Device for controlling the flow of fluid
Inventor:
Ho Chow
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: May 1, 1980
Inventor
Ho Chow
Assignee (at issue)
Beatrice Foods Co.
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.