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Inventor

Dale V. Johnson

Inventor
Metairie, LA, US

Overview

6→
Patents
1982–1991
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 6 as inventor

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

E21Bprimary
E21BEarth or rock drilling71%
G01BMeasuring length, thickness or similar linear dimensions14%
Y10TTechnical subjects covered by former us classification14%
PatentTitleYear
5,004,007'Chemical injection valve'19914,858,694'Heave compensated stabbing and landing tool'1989H0000635'Injection mandrel'19894,651,818'Metal seal tubing plug'19874,615,387'Annular gas trap'19864,321,751'Depth measurements'1982

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1982–1991Patents assigned to EXXON PRODUCTION RESEARCH CO (5)· patent assignee history
1982Based in Jefferson, LA, US· patent location history
1986–1991Based in Metairie, LA, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
EXXON PRODUCTION RESEARCH CO51982–1991
Locations
LocationPatentsSpan
Metairie, LA, US51986–1991
Jefferson, LA, US11982