Granted Patent
Utility
US 5,212,199 · App. 07/871,643
Sorbitan esters as skin permeation enhancers
Inventors:
Sonia J. Heiber, Dinesh C. Patel, Charles D. Ebert
Patented Case
View Patent ↗
Granted: May 18, 1993
Filed: Apr 21, 1992
Inventors
Sonia J. Heiber
Dinesh C. Patel
Charles D. Ebert
Assignee (at issue)
TheraTech, 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.