Granted Patent
Utility
US 6,730,636 · App. 10/135,492
Environmentally acceptable well cement fluid loss control additives, compositions and methods
Inventors:
Jan Pieter Vijn, Bach Dao, Mohand Melbouci
Patented Case
View Patent ↗
Granted: May 4, 2004
Filed: Apr 30, 2002
Inventors
Jan Pieter Vijn
Bach Dao
Mohand Melbouci
Assignee (at issue)
Halliburton Energy Services, 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.