Granted Patent
Utility
US 4,497,837 · App. 06/368,033
Method for electrostatic, epoxy coating of steel drum interiors and product thereof
Inventor:
Donald E. Oswald
Patented Case
View Patent ↗
Granted: Feb 5, 1985
Filed: Apr 13, 1982
Inventor
Donald E. Oswald
Assignee (at issue)
Kaiser Steel (Delaware), Inc.
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.