Granted Patent
Utility
US 4,845,207 · App. 07/063,568
3-alkoxy-2-hydroxypropylhydroxyethylcellulose and building composition containing the same
Inventor:
Harald E. t'Sas
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Jun 17, 1987
Inventor
Harald E. t'Sas
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.