Individual holder
EVANS ROBERT W
US·31 granted patents·2 pending applications·440 citations·filing 1980–2025
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
33 records- 0195US10151165B2Adjustable hydraulic jarring deviceEVANS ROBERT W·Filed 2016·Granted Dec 11, 2018·7 cites·4 claims
- 0294US11702898B2Adjustable hydraulic jarring deviceEVANS ROBERT W·Filed 2021·Granted Jul 18, 2023·2 cites·6 claims
- 0394US8205690B2Dual acting locking jarEVANS ROBERT W·Filed 2010·Granted Jun 26, 2012·22 cites·12 claims
- 0493US12252947B2Adjustable hydraulic jarring deviceEVANS ROBERT W·Filed 2023·Granted Mar 18, 2025·1 cites·4 claims
- 0593US10408009B2Release lugs for a jarring deviceEVANS ROBERT W·Filed 2018·Granted Sep 10, 2019·5 cites·10 claims
- 0691US8561688B2Compact jar for dislodging tools in an oil or gas wellEVANS ROBERT W·Filed 2012·Granted Oct 22, 2013·12 cites·19 claims
- 0789US11105170B2Adjustable hydraulic jarring deviceEVANS ROBERT W·Filed 2018·Granted Aug 31, 2021·3 cites·6 claims
- 0889US7510008B2Method and apparatus for decreasing drag force of trigger mechanismEVANS ROBERT W·Filed 2007·Granted Mar 31, 2009·35 cites·12 claims
- 0986US11473385B2Release lugs for a jarring deviceEVANS ROBERT W·Filed 2021·Granted Oct 18, 2022·1 cites·3 claims
- 1085US5318139AReduced waiting time hydraulic drilling jarEVANS ROBERT W·Filed 1993·Granted Jun 7, 1994·45 cites·11 claims
- 1183US9428980B2Hydraulic/mechanical tight hole jarEVANS ROBERT W·Filed 2010·Granted Aug 30, 2016·8 cites·21 claims
- 1282US4361195ADouble acting hydraulic mechanismEVANS ROBERT W·Filed 1980·Granted Nov 30, 1982·58 cites·35 claims
- 1382US2025215760A1Adjustable Hydraulic Jarring DeviceEVANS ROBERT W·Filed 2025·Application pending·0 cites
- 1481US12281532B2Predetermined load release device for a jarEVANS ROBERT W·Filed 2023·Granted Apr 22, 2025·0 cites·4 claims
- 1581US12139988B2Release lugs for a jarring deviceEVANS ROBERT W·Filed 2023·Granted Nov 12, 2024·0 cites·5 claims
- 1677US11821278B2Release lugs for a jarring deviceEVANS ROBERT W·Filed 2022·Granted Nov 21, 2023·0 cites·15 claims
- 1777US11802458B2Predetermined load release device for a jarEVANS ROBERT W·Filed 2022·Granted Oct 31, 2023·0 cites·11 claims
- 1877US8256509B2Compact jar for dislodging tools in an oil or gas wellEVANS ROBERT W·Filed 2009·Granted Sep 4, 2012·13 cites·7 claims
- 1977US4566546ASingle acting hydraulic fishing jarEVANS ROBERT W·Filed 1984·Granted Jan 28, 1986·46 cites·20 claims
- 2076US9328567B2Double-acting shock damper for a downhole assemblyEVANS ROBERT W·Filed 2012·Granted May 3, 2016·5 cites·18 claims
- 2175US6988551B2Jar with adjustable trigger loadEVANS ROBERT W·Filed 2003·Granted Jan 24, 2006·45 cites·12 claims
- 2274US9255456B2Method and apparatus for improving the efficiency of a positive displacement motor for drilling and oil or gas wellEVANS ROBERT W·Filed 2013·Granted Feb 9, 2016·4 cites·9 claims
- 2374US5232060ADouble-acting accelerator for use with hydraulic drilling jarsEVANS ROBERT W·Filed 1991·Granted Aug 3, 1993·57 cites·15 claims
- 2473US10202815B2Release lugs for a jarring deviceEVANS ROBERT W·Filed 2015·Granted Feb 12, 2019·2 cites·4 claims
- 2571US11959350B2Release lugs for a jarring deviceEVANS ROBERT W·Filed 2022·Granted Apr 16, 2024·0 cites·15 claims
- 2667US11230901B2Release lugs for a jarring deviceEVANS ROBERT W·Filed 2020·Granted Jan 25, 2022·0 cites·16 claims
- 2767US7290604B2Downhole tool with pressure balancingEVANS ROBERT W·Filed 2003·Granted Nov 6, 2007·31 cites·8 claims
- 2865US11105169B2Release lugs for a jarring deviceEVANS ROBERT W·Filed 2019·Granted Aug 31, 2021·0 cites·10 claims
- 2965US2022235620A1Release Mechanism for a Jarring ToolEVANS ROBERT W·Filed 2022·Application pending·0 cites
- 3064US7311149B2Jar with adjustable preloadEVANS ROBERT W·Filed 2003·Granted Dec 25, 2007·27 cites·13 claims
- 3163US8443902B2Time-controlled release device for wireline conveyed toolsEVANS ROBERT W·Filed 2009·Granted May 21, 2013·7 cites·21 claims
- 3260US11414947B2Release mechanism for a jarring toolEVANS ROBERT W·Filed 2019·Granted Aug 16, 2022·0 cites·4 claims
- 3351USD276837SEqualizing valve manifoldEVANS ROBERT W·Filed 1982·Granted Dec 18, 1984·4 cites·1 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →