Granted Patent
Utility
US 4,558,080 · App. 06/573,353
Stable tannin based polymer compound
Inventors:
Jane E. Quamme, Anne H. Kemp
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Jan 24, 1984
Inventors
Jane E. Quamme
Anne H. Kemp
Assignee (at issue)
Dearborn Chemical Company 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.