Granted Patent
Utility
US 4,303,777 · App. 06/156,704
Acetal carboxylic acid polymers
Inventors:
Marvin M. Crutchfield, David R. Dyroff
Patented Case
View Patent ↗
Granted: Dec 1, 1981
Filed: Jun 5, 1980
Inventors
Marvin M. Crutchfield
David R. Dyroff
Assignee (at issue)
Monsanto 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.