Granted Patent
Utility
US 4,657,582 · App. 06/739,264
Polyhydroxy polymer delivery systems
Inventor:
Ludwig K. Huber
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: May 30, 1985
Inventor
Ludwig K. Huber
Assignee (at issue)
Pennwalt Corporation
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.