Granted Patent
Utility
US 5,753,190 · App. 08/505,428
Vacuum system for controlling pressure in a polyester process
Inventors:
Douglas M. Haseltine, Thomas Lloyd Yount, Jimmy L. Ryans
Patented Case
View Patent ↗
Granted: May 19, 1998
Filed: Jul 21, 1995
Inventors
Douglas M. Haseltine
Thomas Lloyd Yount
Jimmy L. Ryans
Assignee (at issue)
Eastman Chemical 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.