Granted Patent
Utility
US 6,139,623 · App. 09/009,370
Emulsified comb polymer and defoaming agent composition and method of making same
Inventors:
David C. Darwin, Robert T. Taylor, Ara A. Jeknavorian, Ding Feng Shen
Patented Case
View Patent ↗
Granted: Oct 31, 2000
Filed: Jan 20, 1998
Inventors
David C. Darwin
Robert T. Taylor
Ara A. Jeknavorian
Ding Feng Shen
Assignee (at issue)
W.R. Grace & Co. Conn.
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.