Granted Patent
Utility
US 5,407,475 · App. 08/043,681
Thermally stable thiosulfate hydroxyethylcellulose suspension
Inventors:
Carl A. Lukach, Jose Zapico
Patented Case
View Patent ↗
Granted: Apr 18, 1995
Filed: Apr 8, 1993
Inventors
Carl A. Lukach
Jose Zapico
Assignee (at issue)
Aqualon Company
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.