Granted Patent
Utility
US 4,795,506 · App. 07/086,280
Process for after-treatment of metals using 2,2-bis(4-hydroxyphenyl)alkyl poly derivatives
Inventor:
Stanley M. Sokalski
Patented Case
View Patent ↗
Granted: Jan 3, 1989
Filed: Aug 17, 1987
Inventor
Stanley M. Sokalski
Assignee (at issue)
Detrex Corporation
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.