Granted Patent
Utility
US 4,120,982 · App. 05/615,334
Hydroxypropylated, epichlorohydrin crosslinked tapioca starch derivative for acid retort media
Inventors:
James E. Eastman, Frank del Valle
Patented Case
View Patent ↗
Granted: Oct 17, 1978
Filed: Sep 22, 1975
Inventors
James E. Eastman
Frank del Valle
Assignee (at issue)
A.E. Staley Manufacturing 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.