Granted Patent
Utility
US 5,175,277 · App. 07/672,505
Rapidly hydrating welan gum
Inventors:
Walter Rakitsky, Danny D. Richey
Patented Case
View Patent ↗
Granted: Dec 29, 1992
Filed: Mar 20, 1991
Inventors
Walter Rakitsky
Danny D. Richey
Assignee (at issue)
MERCK & CO., INC.
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.