Christensen, Inc.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
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
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Expired/Abandoned/Withdrawn Patents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
4665888 Serving table for kettle-type barbecue cookerExpiredDec 16, 85May 19, 87[A47J, F24B]
4460053 Drill tool for deep wellsExpiredAug 14, 81Jul 17, 84[E21B]
4452322 Drilling device for drilling a core in deep drill holesExpiredMay 13, 82Jun 05, 84[E21B]
4452324 Rotary drill bitExpiredOct 19, 81Jun 05, 84[E21B]
4440246 Cutting member for rotary drill bitsExpiredMar 24, 82Apr 03, 84[E21B]
4429741 Self powered downhole tool anchorExpiredOct 13, 81Feb 07, 84[E21B]
4415316 Down hole motorExpiredApr 27, 81Nov 15, 83[F03C, F01C]
4415823 Generator for the production of electrical energyExpiredAug 03, 81Nov 15, 83[H02K]
4391328 Drill string safety valveExpiredMay 20, 81Jul 05, 83[E21B]
4373593 Drill bitExpiredMar 10, 80Feb 15, 83[E21B]
4361194 Bearing system for a downhole motorExpiredSep 30, 80Nov 30, 82[E21B]
4356872 Downhole core barrel flushing systemExpiredAug 21, 80Nov 02, 82[E21B]
4352400 Drill bitExpiredDec 01, 80Oct 05, 82[E21B]
4351401 Earth-boring drill bitsExpiredJun 13, 80Sep 28, 82[E21B]
4336850 Internal fluid screen to prevent nozzle and port pluggingExpiredSep 12, 80Jun 29, 82[E21B]
4310059 Composite heavy metal drill collarExpiredJan 21, 80Jan 12, 82[F16L, E21B]
4278138 Composite heavy metal drill collarExpiredJan 21, 80Jul 14, 81[F16L, E21B]
4275528 Electroplated diamond milling cutterExpiredSep 10, 79Jun 30, 81[B24B]
4272987 Pressure core barrel flushing systemExpiredDec 03, 79Jun 16, 81[E21B]
4270569 Valve assembly for the remote control of fluid flow having an automatic time delayExpiredOct 16, 78Jun 02, 81[F16K]

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