GEARHEART INDUSTRIES, INC., A CORP. OF TEXAS

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4889187 Multi-run chemical cutter and methodExpiredApr 25, 88Dec 26, 89[E21B]
4730263 Method and device for measuring gamma radiationExpiredMar 04, 85Mar 08, 88[G06F, G01C]
4709357 Method and apparatus for acoustically investigating a borehole casing cement bondExpiredAug 14, 85Nov 24, 87[G01U]
4703804 Debris removal and gauge ring device and methodExpiredJun 20, 86Nov 03, 87[E21B]
4697638 Downhole logging and servicing system with manipulatable logging and servicing toolsExpiredJan 22, 86Oct 06, 87[E21B]
4694166 Logging device having bimetallic insulating flaskExpiredMay 28, 85Sep 15, 87[G01V]
4646026 Method and apparatus for measuring resistivity of an earth formationExpiredOct 10, 85Feb 24, 87[G01V]
4620591 Chemical cutting apparatus having selective pressure bleed-offExpiredApr 12, 85Nov 04, 86[E21B]
4619318 Chemical cutting method and apparatusExpiredSep 27, 84Oct 28, 86[E21B]
4613394 Staged chemical pipe cutterExpiredMar 14, 84Sep 23, 86[E21B]
4603578 Side entry sub with tension release wireline cable clampExpiredOct 10, 84Aug 05, 86[E21B]
4562743 Cable elongation measurement apparatusExpiredMay 21, 84Jan 07, 86[G01N]
4558220 Radioactivity well loggingExpiredOct 02, 81Dec 10, 85[G01V]
4530161 Caliper tool using magnetostrictive displacement transducerExpiredJun 15, 84Jul 23, 85[G01B]
4523148 Method and apparatus for determining the spontaneous earth potential log from downhole gradient measurementsExpiredJul 13, 81Jun 11, 85[G01V]
4506729 Drill string sub with self closing cable port valveExpiredFeb 22, 83Mar 26, 85[E21B]
4506156 Earth formation porosity determination with dual epithermal neutron detector systemExpiredJul 31, 81Mar 19, 85[G01V]
4502010 Apparatus including a magnetometer having a pair of U-shaped cores for extended lateral range electrical conductivity loggingExpiredNov 22, 82Feb 26, 85[G01R, G01V]
4494601 Downhole chemical cutting toolExpiredSep 14, 81Jan 22, 85[E21B]
4491178 Through tubing bridge plugExpiredAug 11, 83Jan 01, 85[E21B]

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