Inventor · disambiguated record
Michael Stephens
Also filed as: STEPHENS MICHAEL · STEPHENS MICHAEL S
8 granted patents·133 citations·filing 1989–1999
87Inventor score
Files withPHILLIPS PETROLEUM CO8
Top patents by PatentIndex Score
8 records- 0182US5109042AFluid loss additive for cement slurries containing a n-vinyl-2-pyrrolidone-ω-2-acrylamido-2-methylpropane sulfonate-ω-acrylic acid-ω-acrylamide polymerPHILLIPS PETROLEUM CO·Filed 1989·Granted Apr 28, 1992·41 cites·3 claims
- 0275US5294651AFluid loss additives for well cementing compositionsPHILLIPS PETROLEUM CO·Filed 1992·Granted Mar 15, 1994·30 cites·6 claims
- 0363US5135909ADrilling mud comprising tetrapolymer consisting of N-vinyl-2-pyrrolidone, acrylamidopropanesulfonic acid, acrylamide, and acrylic acidPHILLIPS PETROLEUM CO·Filed 1990·Granted Aug 4, 1992·19 cites·4 claims
- 0456US5153240AFluid loss additives for well cementing compositions containing a tetrapolymerPHILLIPS PETROLEUM CO·Filed 1990·Granted Oct 6, 1992·14 cites·5 claims
- 0555US5041630AWell cement slurries and dispersants thereforPHILLIPS PETROLEUM CO·Filed 1990·Granted Aug 20, 1991·13 cites·7 claims
- 0649US5380705ADrilling mud comprising tetrapolymer consisting of n-vinyl-2-pyrrolidone, acrylamidopropanesulfonicacid, acrylamide, and acrylic acidPHILLIPS PETROLEUM CO·Filed 1994·Granted Jan 10, 1995·9 cites·18 claims
- 0739US6176314B1Low density well cement compositions and method of usePHILLIPS PETROLEUM CO·Filed 1999·Granted Jan 23, 2001·6 cites·9 claims
- 0830US4923516AWell cement slurries and dispersants thereforPHILLIPS PETROLEUM CO·Filed 1989·Granted May 8, 1990·1 cites·22 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →