Granted Patent
Utility
US 6,793,840 · App. 10/415,563
Azeotrope mixtures with perfluorobutylethylene
Inventors:
Hyunkook Shin, Chien-Ping Kao, Thomas Schweiger
Patented Case
View Patent ↗
Granted: Sep 21, 2004
Filed: Sep 4, 2003
Inventors
Hyunkook Shin
Chien-Ping Kao
Thomas Schweiger
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND 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.