Granted Patent
Utility
US 4,793,997 · App. 07/068,787
Controlled delivery device
Inventors:
Cyril F. Drake, Alfred J. Arch
Patented Case
View Patent ↗
Granted: Dec 27, 1988
Filed: Jun 29, 1987
Inventors
Cyril F. Drake
Alfred J. Arch
Assignee (at issue)
Standard Telephone Cables Public Ltd. Co.
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.