EASTMAN CHRISTENSEN COMPANY

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21B EARTH OR ROCK DRILLING 195
 
  
 
E21C MINING OR QUARRYING121

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5090491 Earth boring drill bit with matrix displacing materialMar 04, 91Feb 25, 92[E21B]
RE32463 Method of and apparatus for telemetering information from a point in a well borehole to the earth's surfaceNov 06, 79Jul 28, 87[E21C]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5205684 Multi-component cutting element using consolidated rod-like polycrystalline diamondExpiredAug 11, 92Apr 27, 93[B23B, E21B]
5099931 Method and apparatus for optional straight hole drilling or directional drilling in earth formationsExpiredMar 05, 91Mar 31, 92[E21B]
5028177 Multi-component cutting element using triangular, rectangular and higher order polyhedral-shaped polycrystalline diamond disksExpiredAug 24, 89Jul 02, 91[E21B]
5004057 Drill bit with improved steerabilityExpiredAug 14, 89Apr 02, 91[E21B]
4953595 Mud pulse valve and method of valving in a mud flow for sharper rise and fall times, faster data pulse rates, and longer lifetime of the mud pulse valveExpiredMay 10, 89Sep 04, 90[F16K]
4919013 Preformed elements for a rotary drill bitExpiredSep 14, 88Apr 24, 90[B21K, B22F]
D307279 Cutting tooth for a rotating drag bitExpiredOct 16, 86Apr 17, 90[]
4913244 Large compact cutter rotary drill bit utilizing directed hydraulics for each cutterExpiredOct 31, 88Apr 03, 90[E21B]
4913247 Drill bit having improved cutter configurationExpiredJun 09, 88Apr 03, 90[E21B]
4905778 Device for producing pressure pulses in an oil well fluid mediumExpiredMay 09, 88Mar 06, 90[E21B, G01V]
4904228 Universal ball jointExpiredJun 20, 84Feb 27, 90[F16D]
4901804 Articulated downhole surveying instrument assemblyExpiredAug 15, 88Feb 20, 90[E21B]
4901290 Apparatus for the generation of pressure pulses in drilling mud compositionsExpiredMay 09, 88Feb 13, 90[G01V]
4892420 Friction bearing for deep well drilling toolsExpiredMar 24, 88Jan 09, 90[F16C, E21B]
4889195 Drill bit direct drive for deep well drilling toolsExpiredMar 24, 88Dec 26, 89[E21B]
4884477 Rotary drill bit with abrasion and erosion resistant facingExpiredMar 31, 88Dec 05, 89[B22F]
4883132 Drag bit for drilling in plastic formation with maximum chip clearance and hydraulic for direct chip impingementExpiredSep 09, 88Nov 28, 89[E21B]
4883136 Large compact cutter rotary drill bit utilizing directed hydraulics for each cutterExpiredJan 19, 88Nov 28, 89[E21B]
4878548 Nozzle retention system for a drill bitExpiredJan 21, 88Nov 07, 89[E21B]
4877096 Replaceable cutter using internal ductile metal receptaclesExpiredApr 07, 89Oct 31, 89[E21B]

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