Granted Patent
Utility
US 6,140,089 · App. 09/251,004
Chitosan core matrix containing cells encapsulated in a thermoplastic semipermeable membrane
Inventors:
Patrick Aebischer, Beth A. Zielinski
Patented Case
View Patent ↗
Granted: Oct 31, 2000
Filed: Feb 16, 1999
Inventors
Patrick Aebischer
Beth A. Zielinski
Assignee (at issue)
Brown University Research Foundation
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.