Granted Patent
Utility
US 6,573,221 · App. 09/812,895
Non-pyruvylated xanthan in oil field applications utilizing high density calcium-based brines
Inventors:
Todd A. Talashek, Mac Seheult, Trish Carter, Reinaldo C. Navarrete, Helena Chang
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: Mar 21, 2001
Inventors
Todd A. Talashek
Mac Seheult
Trish Carter
Reinaldo C. Navarrete
Helena Chang
Assignee (at issue)
CP Kelco U.S., 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.