Granted Patent
Utility
US 4,254,249 · App. 06/961,820
Copolymers of N,N-dimethylacrylamide and acrylamide
Inventors:
Ian W. Cottrell, John K. Baird, Jaewon L. Shim
Patented Case
View Patent ↗
Granted: Mar 3, 1981
Filed: Nov 17, 1978
Inventors
Ian W. Cottrell
John K. Baird
Jaewon L. Shim
Assignee (at issue)
MERCK & CO., INC.
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.