LexDanaLexDanabeta
Inventor

Darrell Johnson

Inventor
Katy, TX, US

Overview

4→
Patents
1993–2007
Patent span
Performing operations
Primary field (CPC B)

Patents· 4 as inventor

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

B29Cprimary
B29CShaping or joining of plastics33%
E21BEarth or rock drilling33%
G01RMeasuring electric variables33%
PatentTitleYear
7,278,497'Method for extracting coal bed methane with source fluid injection'20076,114,847'Connectionless signal detection device for conductive cables'20005,733,582'Apparatus for support of large shipping containers during foaming'1998D0341601'Machine for foaming refrigerator cavities'1993

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1993–1998Patents assigned to CON TEK MACHINE INC (2)· patent assignee history
1993Based in White Bear Lake, MN, US· patent location history
1998Based in Stillwater, MN, US· patent location history
2000Based in La Mesa, CA, US· patent location history
2007Patents assigned to WEATHERFORD LAMB (1)· patent assignee history
2007Based in Katy, TX, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
CON TEK MACHINE INC21993–1998
WEATHERFORD LAMB12007
Locations
LocationPatentsSpan
Katy, Texas, US12007
La Mesa, California, US12000
Stillwater, Minnesota, US11998
White Bear Lake, Minnesota, US11993