Granted Patent
Utility
US 4,336,236 · App. 06/247,441
Double precipitation reaction for the formation of high purity basic lead carbonate and high purity normal lead carbonate
Inventors:
Michael A. Kolakowski, John Valachovic
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Mar 25, 1981
Inventors
Michael A. Kolakowski
John Valachovic
Assignee (at issue)
NL Industries, 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.