Granted Patent
Utility
US 5,785,297 · App. 08/682,170
Valve mechanism
Inventor:
Don Dongcho Ha
Patented Case
View Patent ↗
Granted: Jul 28, 1998
Filed: Jul 16, 1996
Inventor
Don Dongcho Ha
Assignee (at issue)
Millipore 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.