Granted Patent
Utility
US 5,221,489 · App. 07/840,383
Sulfonated polymeric dispersant compositions for subterranean well drilling, completion, and cementing
Inventors:
James B. Bloys, Richard F. Morgan
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: Feb 24, 1992
Inventors
James B. Bloys
Richard F. Morgan
Assignee (at issue)
Atlantic Richfield 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.