Granted Patent
Utility
US 4,594,380 · App. 06/729,267
Elastomeric controlled release formulation and article comprising same
Inventors:
John T. Chapin, Raffaele A. Sabia
Patented Case
View Patent ↗
Granted: Jun 10, 1986
Filed: May 1, 1985
Inventors
John T. Chapin
Raffaele A. Sabia
Assignee (at issue)
AT&T Bell Laboratories
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.