Granted Patent
Utility
US 4,299,782 · App. 06/133,297
Phosphorus derivatives of 1,3-diethanolurea
Inventors:
Mabel Chen, Stanley R. Sandler
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: Mar 24, 1980
Inventors
Mabel Chen
Stanley R. Sandler
Assignee (at issue)
Pennwalt Corporation
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.