Granted Patent
Utility
US 6,057,061 · App. 08/969,235
Ethylene-vinyl alcohol copolymer battery separator
Inventors:
Robert W. Callahan, Hongkyu Kim
Patented Case
View Patent ↗
Granted: May 2, 2000
Filed: Nov 13, 1997
Inventors
Robert W. Callahan
Hongkyu Kim
Assignee (at issue)
Celgard, 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.