Granted Patent
Utility
US 5,306,821 · App. 07/819,429
Process for the preparation of tertiary carbinamines
Inventor:
Engelbert Ciganek
Patented Case
View Patent ↗
Granted: Apr 26, 1994
Filed: Jan 10, 1992
Inventor
Engelbert Ciganek
Assignee (at issue)
The DuPont Merck Pharmaceutical 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.