Granted Patent
Utility
US 6,146,352 · App. 08/822,513
Implantable drainage valve for the treatment of hydrocephalus
Inventor:
Olivier Bonnal
Patented Case
View Patent ↗
Granted: Nov 14, 2000
Filed: Mar 24, 1997
Inventor
Olivier Bonnal
Assignee (at issue)
Cordis SA
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.