Granted Patent
Utility
US 5,342,964 · App. 08/040,805
Process for obtaining the isomeric compound 1-vinyl-3(E)-ethylidene pyrrolidone
Inventors:
Susan Y. Tseng, Philip F. Wolf
Patented Case
View Patent ↗
Granted: Aug 30, 1994
Filed: Mar 31, 1993
Inventors
Susan Y. Tseng
Philip F. Wolf
Assignee (at issue)
ISP INVESTMENTS LLC
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.