Inventor · disambiguated record
Walter H. Fertl
Also filed as: FERTL WALTER H
21 granted patents·365 citations·filing 1974–1989
96Inventor score
Top patents by PatentIndex Score
21 records- 0190US4415805AMethod and apparatus for evaluating multiple stage fracturing or earth formations surrounding a boreholeDRESSER IND·Filed 1981·Granted Nov 15, 1983·91 cites·8 claims
- 0276US4953399AMethod and apparatus for determining characteristics of clay-bearing formationsWESTERN ATLAS INT INC·Filed 1989·Granted Sep 4, 1990·50 cites·10 claims
- 0365US4507553AMethod and apparatus for identifying vanadium in earth formationsDRESSER IND·Filed 1982·Granted Mar 26, 1985·22 cites·3 claims
- 0462US4187908AMethod for ascertaining optimum location for well stimulation and/or perforationDRESSER IND·Filed 1978·Granted Feb 12, 1980·19 cites·5 claims
- 0559US4399359AMethod for monitoring flood front movement during water flooding of subsurface formationsDRESSER IND·Filed 1980·Granted Aug 16, 1983·25 cites·9 claims
- 0658US4263509AMethod for in situ determination of the cation exchange capacities of subsurface formationsDRESSER IND·Filed 1979·Granted Apr 21, 1981·24 cites·8 claims
- 0750US4178506AMethod for detecting fractures in formations surrounding earth boreholesDRESSER IND·Filed 1977·Granted Dec 11, 1979·14 cites·6 claims
- 0850US3949220AMethod for detecting and locating sand producing zones in friable, unconsolidated sandstone formations of subterranean formationsCONTINENTAL OIL CO·Filed 1974·Granted Apr 6, 1976·7 cites·11 claims
- 0949US4346592AMethod for determining effective reservoir porosityDRESSER IND·Filed 1980·Granted Aug 31, 1982·19 cites·15 claims
- 1048US4622849AMethod and apparatus for determining characteristics of clay-bearing formationsDRESSER IND·Filed 1985·Granted Nov 18, 1986·13 cites·12 claims
- 1147US4756189AMethod and apparatus for determining characteristics of clay-bearing formationsWESTERN ATLAS INT INC·Filed 1986·Granted Jul 12, 1988·17 cites·4 claims
- 1246US4173718AMethod for monitoring fluid movement behind casing in oil and gas wellsDRESSER IND·Filed 1977·Granted Nov 6, 1979·12 cites·3 claims
- 1344US4594887AMethod and apparatus for determining characteristics of clay-bearing formationsDRESSER IND·Filed 1982·Granted Jun 17, 1986·14 cites·62 claims
- 1441US3940612AMethod for detecting and locating water-producing zones and/or water thief zones in subterranean formationsCONTINENTAL OIL CO·Filed 1974·Granted Feb 24, 1976·4 cites·12 claims
- 1538US4484470AMethod and apparatus for determining characteristics of clay-bearing formationsDRESSER IND·Filed 1983·Granted Nov 27, 1984·8 cites·20 claims
- 1635US4494071ADetermination of water saturation in earth formations independent of lithologyDRESSER IND·Filed 1982·Granted Jan 15, 1985·5 cites·1 claims
- 1734US4617517ADetermination of water saturation in earth formations independent of lithologyDRESSER IND·Filed 1984·Granted Oct 14, 1986·4 cites·9 claims
- 1834US4115688AMining and drilling control of distance to the coal-shale interface - thorium measurement by gamma spectrometryCONTINENTAL OIL CO·Filed 1977·Granted Sep 19, 1978·5 cites·10 claims
- 1933US4636994AMethod of determining shear wave travel time in subsurface formationsDRESSER IND·Filed 1983·Granted Jan 13, 1987·4 cites·13 claims
- 2032US4700140ADetermination of water or residual oil saturation in earth formations independent of lithologyWESTERN ATLAS INT INC·Filed 1985·Granted Oct 13, 1987·4 cites·9 claims
- 2132US4118623AContinuous quality control of mined hard and soft coalsCONTINENTAL OIL CO·Filed 1977·Granted Oct 3, 1978·4 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →