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Inventor

Lewis D. Proctor

Inventor
Marykirk, GB

Overview

3→
Patents
1988–1994
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 3 as inventor

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

E21Bprimary
E21BEarth or rock drilling100%
PatentTitleYear
5,329,999'Annular safety system'19944,840,229'Multiple position service seal unit with positive position indicating means'19894,722,392'Multiple position service seal unit with positive position indicating means'1988

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1988–1989Patents assigned to OTIS ENG CO (2)· patent assignee history
1988Based in Laurencekirk, GB· patent location history
1989Based in Kincardineshire, GB· patent location history
1994Patents assigned to HALLIBURTON CO (1)· patent assignee history
1994Based in Marykirk, GB· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
OTIS ENG CO21988–1989
HALLIBURTON CO11994
Locations
LocationPatentsSpan
Marykirk, GB11994
Kincardineshire, GB11989
Laurencekirk, GB11988