Inventor · disambiguated record
Robert F. Crane
Also filed as: CRANE ROBERT · CRANE ROBERT F
68 granted patents·23 pending applications·1,135 citations·filing 1989–2024
99Inventor score
Files withEARTH TOOL CO LLC53CHARLES MACHINE WORKS12WENTWORTH STEVEN W9EARTH TOOL CORP7CRANE ROBERT F3
Top patents by PatentIndex Score
91 records- 0193US7086808B2Method and apparatus for on-grade boringEARTH TOOL CO LLC·Filed 2002·Granted Aug 8, 2006·52 cites·15 claims
- 0290US6568488B2Roller pipe bursterEARTH TOOL CO LLC·Filed 2001·Granted May 27, 2003·100 cites·22 claims
- 0389US9611696B2Directional drill hammer pullback deviceEARTH TOOL CO LLC·Filed 2015·Granted Apr 4, 2017·6 cites·20 claims
- 0488US6588515B2Drill bit for directional drillingEARTH TOOL CO LLC·Filed 2001·Granted Jul 8, 2003·23 cites·43 claims
- 0588US6390087B1Drill bit for directional drillingEARTH TOOL CO LLC·Filed 1999·Granted May 21, 2002·39 cites·13 claims
- 0688US6148935AJoint for use in a directional boring apparatusEARTH TOOL CO LLC·Filed 1998·Granted Nov 21, 2000·81 cites·31 claims
- 0787US10969053B2Lead pipe spudding prior to extraction or remediationEARTH TOOL CO LLC·Filed 2018·Granted Apr 6, 2021·3 cites·14 claims
- 0887US9169946B2Directional drill hammer pullback deviceEARTH TOOL CO LLC·Filed 2014·Granted Oct 27, 2015·9 cites·39 claims
- 0987US6755593B2Pipe replacement method and rotary impact mechanism for pipe burstingEARTH TOOL CO LLC·Filed 2002·Granted Jun 29, 2004·38 cites·14 claims
- 1086US10584807B2Extraction of ductile pipeEARTH TOOL CO LLC·Filed 2018·Granted Mar 10, 2020·3 cites·40 claims
- 1186US8955586B1Beacon assemblyRANDA MARK D·Filed 2012·Granted Feb 17, 2015·10 cites·16 claims
- 1281US11619336B2Pipe slitting machine with rope storage reelCHARLES MACHINE WORKS·Filed 2020·Granted Apr 4, 2023·1 cites·22 claims
- 1381US7559722B2Method and apparatus for pipe reforming and clearingEARTH TOOL CO LLC·Filed 2007·Granted Jul 14, 2009·11 cites·16 claims
- 1480US9512951B2Pipe slitting apparatusEARTH TOOL CO LLC·Filed 2015·Granted Dec 6, 2016·3 cites·17 claims
- 1579US12410879B2Latch assembly for use with an inversion drumCHARLES MACHINE WORKS·Filed 2024·Granted Sep 9, 2025·0 cites·23 claims
- 1678US10246949B2Slip style rod spinner for pipe bursting machineEARTH TOOL CO LLC·Filed 2018·Granted Apr 2, 2019·2 cites·19 claims
- 1778US6450269B1Method and bit for directional horizontal boringEARTH TOOL CO LLC·Filed 2000·Granted Sep 17, 2002·53 cites·17 claims
- 1877US9566653B2Pipe slitterEARTH TOOL CO LLC·Filed 2014·Granted Feb 14, 2017·4 cites·21 claims
- 1977US6860514B2Drill string jointEARTHJTOOL COMPANY L L C·Filed 2003·Granted Mar 1, 2005·56 cites·6 claims
- 2077US6263983B1Apparatus for directional drillingEARTH TOOL CO LLC·Filed 1999·Granted Jul 24, 2001·23 cites·19 claims
- 2177US5025868APneumatic ground piercing toolEARTH TOOL CORP·Filed 1989·Granted Jun 25, 1991·52 cites·23 claims
- 2276US8979435B2Rod pulling and pushing machine for pipe burstingWENTWORTH STEVEN W·Filed 2011·Granted Mar 17, 2015·4 cites·10 claims
- 2375US7255516B2Method and apparatus for replacement of underground pipeEARTH TOOL CO LLC·Filed 2005·Granted Aug 14, 2007·13 cites·10 claims
- 2475US6470979B1Sonde housing structureEARTH TOOL CO LLC·Filed 2000·Granted Oct 29, 2002·45 cites·20 claims
- 2575US5651639AMethod and apparatus for installation of underground pipeEARTH TOOL CO LLC·Filed 1995·Granted Jul 29, 1997·42 cites·17 claims
- 2674US6260634B1Sonde housing for directional drillingEARTH TOOL CO LLC·Filed 1999·Granted Jul 17, 2001·42 cites·20 claims
- 2773US10161201B2Powered slip actuationEARTH TOOL CO LLC·Filed 2017·Granted Dec 25, 2018·1 cites·18 claims
- 2873US8887833B2Reamer assemblyCRANE ROBERT F·Filed 2011·Granted Nov 18, 2014·5 cites·4 claims
- 2971USD816456SGut hook bladed pipe slitterEARTH TOOL CO LLC·Filed 2017·Granted May 1, 2018·1 cites·1 claims
- 3070US8225885B2Joint for use in back reamingWENTWORTH STEVEN W·Filed 2009·Granted Jul 24, 2012·11 cites·8 claims
- 3170US6302410B1Rod gripping jawEARTH TOOL CO LLC·Filed 1999·Granted Oct 16, 2001·55 cites·14 claims
- 3269US6789635B2Drill bit for directional drilling in cobble formationsEARTH TOOL CO LLC·Filed 2002·Granted Sep 14, 2004·32 cites·33 claims
- 3368US2022325825A1System and method for extracting a buried pipeCHARLES MACHINE WORKS·Filed 2022·Application pending·0 cites
- 3467US12092257B2Lead pipe spudding prior to extraction or remediationCHARLES MACHINE WORKS·Filed 2021·Granted Sep 17, 2024·0 cites·15 claims
- 3567US6321858B1Bit for directional drillingEARTH TOOL CO LLC·Filed 2000·Granted Nov 27, 2001·31 cites·20 claims
- 3666US10883628B2Extraction of ductile pipeCHARLES MACHINE WORKS·Filed 2020·Granted Jan 5, 2021·0 cites·18 claims
- 3766US2021364102A1Pipe Extraction Assisted By Pre-Stressed StrandCHARLES MACHINE WORKS·Filed 2021·Application pending·0 cites
- 3865US11112033B2Pipe extraction assisted by pre-stressed strandCHARLES MACHINE WORKS·Filed 2020·Granted Sep 7, 2021·0 cites·18 claims
- 3965US10550989B2Latch assembly for use with an inversion drumEARTH TOOL CO LLC·Filed 2018·Granted Feb 4, 2020·1 cites·20 claims
- 4063US11913570B1System for applying torsional force to a buried pipe to facilitate extractionCHARLES MACHINE WORKS·Filed 2021·Granted Feb 27, 2024·0 cites·19 claims
- 4163US6533052B2Drill bit for impact-assisted directional boringEARTH TOOL CO LLC·Filed 2001·Granted Mar 18, 2003·27 cites·12 claims
- 4261US9915109B2Slip style rod spinner for pipe bursting machineEARTH TOOL CO LLC·Filed 2014·Granted Mar 13, 2018·1 cites·17 claims
- 4361US2025141196A1Jaw engagement assist systemCHARLES MACHINE WORKS·Filed 2024·Application pending·0 cites
- 4461US2020056725A1System And Method For Extracting A Buried PipeEARTH TOOL CO LLC·Filed 2019·Application pending·0 cites
- 4560US12281726B2Pipe extraction assisted by pre-stressed strandCHARLES MACHINE WORKS·Filed 2022·Granted Apr 22, 2025·0 cites·19 claims
- 4660US7993078B2Method and apparatus for installing an underground pipeHARR TECHNOLOGIES LLC·Filed 2007·Granted Aug 9, 2011·4 cites·14 claims
- 4760US6655874B2Method and apparatus for slitting flexible pipe in an underground boreEARTH TOOL CO LLC·Filed 2001·Granted Dec 2, 2003·9 cites·22 claims
- 4860US2023339077A1Jaw engagement assist systemCHARLES MACHINE WORKS·Filed 2023·Application pending·0 cites
- 4959US8646846B2Method and apparatus for creating a planar cavernWENTWORTH STEVEN W·Filed 2010·Granted Feb 11, 2014·1 cites·18 claims
- 5058US6371223B2Drill head for directional boringEARTH TOOL CO LLC·Filed 2000·Granted Apr 16, 2002·19 cites·24 claims
Showing the top 50 of 91 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →