Granted Patent
Utility
US 4,693,728 · App. 06/770,114
Hydrocolloid blend for controlled release of calcium ions
Inventors:
Kenneth Clare, William Gibson
Patented Case
View Patent ↗
Granted: Sep 15, 1987
Filed: Aug 27, 1985
Inventors
Kenneth Clare
William Gibson
Assignee (at issue)
Kelco International Limited
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.