Granted Patent
Utility
US 5,827,538 · App. 08/571,980
Osmotic devices having vapor-permeable coatings
Inventors:
Edward L. Cussler, Scott M. Herbig, Kelly L. Smith, Paul van Eikeren
Patented Case
View Patent ↗
Granted: Oct 27, 1998
Filed: Jan 17, 1996
Inventors
Edward L. Cussler
Scott M. Herbig
Kelly L. Smith
Paul van Eikeren
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.