Granted Patent
Utility
US 4,253,927 · App. 05/925,591
Material for an alkaline cell separator and a process of making
Inventors:
Philip A. Bernstein, James P. Coffey, Alan E. Varker
Patented Case
View Patent ↗
Granted: Mar 3, 1981
Filed: Jul 17, 1978
Inventors
Philip A. Bernstein
James P. Coffey
Alan E. Varker
Assignee (at issue)
ESB Incorporated
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.