Thomas R. Sifferman has been granted 12 US patents while listed as an inventor at Conoco . The first was granted in 1981 and the most recent in June 2020. Thomas R. Sifferman ranks #396,045 of 4,157,543 US inventors in our database (top 9.5%). Patent records list Thomas R. Sifferman in Ponca City, OK, US.
Patents per Year Patents granted per year, 1981 to 2020 Bar chart with a peak of 2 patents in 1981. peak 2 1981: 2 patents 1981 1983: 2 patents 1983 1992: 1 patents 1992 1994: 1 patents 1994 1999: 1 patents 1999 2001: 1 patents 2001 2002: 1 patents 2002 2014: 2 patents 2014 2020: 1 patents 2020
Issued Patents All Time
Profile Widget
Showing 1–12 of 12 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
10696887 Oxidative breakers in a silicone based suspension Keith Ingram Dismuke , David Philpot , Randal M. Hill , Rondell Pennypacker , Steven Hill 2020-06-30
8916508 Drag-reducing copolymer compositions Earl Parnell , Todd Sanner , Marlin D. Holtmyer , David Philpot , Andrei Zelenev +2 more 2014-12-23
8865632 Drag-reducing copolymer compositions Earl Parnell , Todd Sanner , Marlin D. Holtmyer , David Philpot , Andrei Zelenev +2 more 2014-10-21
6492305 Method of controlling loss of a subterranean treatment fluid John M. Swazey , C. Bryan Skaggs , Nina Nguyen , Daniel B. Solarek 2002-12-10
6180571 Fluid loss control additives and subterranean treatment fluids containing the same John M. Swazey , C. Bryan Skaggs , Nina Nguyen , Daniel B. Solarek 2001-01-30
$175,078,000
5951910 Reticulated bacterial cellulose as a rheological modifier for polyol fluid compositions C. Bryan Skaggs , John M. Swazey , Harold D. Dial , Walter Rakitsky 1999-09-14
$74,635,000
5277830 pH tolerant heteropolysaccharide gels for use in profile control Dennis H. Hoskin 1994-01-11
$33,412,000
5156214 Method for imparting selectivity to polymeric gel systems Dennis H. Hoskin 1992-10-20
$12,657,000
4418755 Methods of inhibiting the flow of water in subterranean formations — 1983-12-06
4412586 Methods of inhibiting the flow of water in subterranean formations — 1983-11-01
4285356 Method of transporting viscous hydrocarbons — 1981-08-25
$24,468,000
4265264 Method of transporting viscous hydrocarbons — 1981-05-05
$10,095,000
