Granted Patent
Utility
US 4,564,438 · App. 06/739,644
Styrene-dialkyl maleate copolymers as dewaxing agents
Inventors:
Sophia Wang, Alan A. Millard
Patented Case
View Patent ↗
Granted: Jan 14, 1986
Filed: May 31, 1985
Inventors
Sophia Wang
Alan A. Millard
Assignee (at issue)
Nalco Chemical Company
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.