Inventor

Rainer Jurgens

Inventor

Celle, DE

Overview

35→

Patents

1976–1999

Patent span

Fixed constructions

Primary field (CPC E)

Patents· 35 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

E21Bprimary

E21BEarth or rock drilling60%

Y10TTechnical subjects covered by former us classification9%

B23PMetal-working not otherwise provided for7%

F04CRotary-piston, or oscillating-piston, positive-displacement machines for liquids5%

B23BTurning4%

F16LPipes4%

H02KDynamo-electric machines4%

B22FWorking metallic powder2%

F03CPositive-displacement engines driven by liquids2%

F04BPositive-displacement machines for liquids2%

PatentTitleYear

5,934,383'Steering device for steerable drilling tool'1999 5,156,222'Directional drilling tool apparatus and method'1992 5,109,924'One trip window cutting tool method and apparatus'1992 5,052,502'Apparatus for directional coring'1991 5,038,873'Drilling tool with retractable pilot drilling unit'1991 5,029,653'Method for directional coring'1991 4,969,528'Method and apparatus for continuous pilot hole coring'1990 4,905,778'Device for producing pressure pulses in an oil well fluid medium'1990 4,873,522'Method for transmitting downhole data in a reduced time'1989 4,732,225'Deep-borehole drilling device with magnetic coupling'1988 4,641,289'Process and device for transmitting information over a distance'1987 4,614,232'Device for delivering flowable material'1986 4,610,307'Method and apparatus for selectively straight or directional drilling in subsurface rock formation'1986 4,553,614'Compensation device for insertion in a drill string for deep-well drilling tools'1985 4,537,097'Method and apparatus for manufacturing cutting elements particularly for deep drilling'1985 4,499,563'Apparatus for transmitting data from a borehole to the surface of the earth during the operation of a drilling device'1985 4,498,549'Cutting member for rotary drill bit'1985 4,471,845'Rotary drill bit'1984 4,468,762'Telemetry equipment in modules'1984 4,463,815'Mechanical jarring tool'1984 4,460,053'Drill tool for deep wells'1984 4,452,322'Drilling device for drilling a core in deep drill holes'1984 4,452,324'Rotary drill bit'1984 4,440,246'Cutting member for rotary drill bits'1984 4,415,823'Generator for the production of electrical energy'1983 4,415,316'Down hole motor'1983 4,373,593'Drill bit'1983 4,252,102'Cutting element for processing rocks, metal or the like'1981 4,200,159'Cutter head, drill bit and similar drilling tools'1980 4,187,061'Rotary helical fluid motor with deformable sleeve for deep drilling tool'1980 4,133,516'Shock absorber for well drilling pipe'1979 4,092,881'Apparatus for making-up and breaking threaded pipe connections'1978 4,011,918'Stabilizer for drill strings'1977 3,993,368'Tool joint wear protectors'1976 3,938,853'Shrink-fit sleeve apparatus for drill strings'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976Patents assigned to CHRISTENSEN DIAMOND PROD CO (2)· patent assignee history

1976–1999Based in Celle, DE· patent location history

1976Based in Westercelle, DT· patent location history

1977–1985Patents assigned to CHRISTENSEN INC (18)· patent assignee history

1980–1987Based in Altencelle, DE· patent location history

1984–1988Based in Celle-Osterloh, DE· patent location history

1985–1988Patents assigned to CHRISTENSEN INC NORTON (5)· patent assignee history

1989–1990Patents assigned to EASTMAN CHRISTENSEN CO (2)· patent assignee history

1990–1999Patents assigned to BAKER HUGHES INC (7)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
CHRISTENSEN INC	18	1977–1985
BAKER HUGHES INC	7	1990–1999
CHRISTENSEN INC NORTON	5	1985–1988
CHRISTENSEN DIAMOND PROD CO	2	1976
EASTMAN CHRISTENSEN CO	2	1989–1990

Locations

Location	Patents	Span
Celle, DE	17	1976–1999
Altencelle, DE	12	1980–1987
Celle-Osterloh, DE	5	1984–1988
Westercelle, DT	1	1976