Granted Patent
Utility
US 6,001,392 · App. 08/994,406
Antitussive drugs delivered by ion exchange resins
Inventors:
Betty P. L. Wen, Michael Ramsay, Heinrich Scheurer, Val Dokuzovic, Vincent Lam
Patented Case
View Patent ↗
Granted: Dec 14, 1999
Filed: Dec 19, 1997
Inventors
Betty P. L. Wen
Michael Ramsay
Heinrich Scheurer
Val Dokuzovic
Vincent Lam
Assignee (at issue)
WARNER-LAMBERT COMPANY LLC
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.