Granted Patent
Utility
US 4,285,223 · App. 06/011,169
Phosphate and ester coating method
Inventors:
Narayan Das, Surya K. Misra
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Feb 12, 1979
Inventors
Narayan Das
Surya K. Misra
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.