Granted Patent
Utility
US 5,489,274 · App. 08/211,650
Rotatable medical valve closure
Inventors:
Michael S. H. Chu, Yem Chin, Andrew H. Cragg, Barry N. Gellman
Patented Case
View Patent ↗
Granted: Feb 6, 1996
Filed: Jul 27, 1994
Inventors
Michael S. H. Chu
Yem Chin
Andrew H. Cragg
Barry N. Gellman
Assignee (at issue)
Boston Scientific 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.