Granted Patent
Utility
US 5,612,059 · App. 07/951,931
Use of asymmetric membranes in delivery devices
Inventors:
John R. Cardinal, Scott M. Herbig, Richard W. Korsmeyer, Jeelin Lo, Kelly L. Smith, Avinash Thombre
Patented Case
View Patent ↗
Granted: Mar 18, 1997
Filed: Sep 25, 1992
Inventors
John R. Cardinal
Scott M. Herbig
Richard W. Korsmeyer
Jeelin Lo
Kelly L. Smith
Avinash Thombre
Assignee (at issue)
Pfizer Inc.
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.