Granted Patent
Utility
US 4,304,935 · App. 06/138,480
Production of 1-phenyl-3-cyanoureas
Inventors:
John V. Brammer-Petersen, Christer L. Hakanson, Per T. Lindgren
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Apr 9, 1980
Inventors
John V. Brammer-Petersen
Christer L. Hakanson
Per T. Lindgren
Assignee (at issue)
Rexolin Chemicals AB
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.