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Inventor

Alex Crabtree

Inventor
Calgary, CA

Overview

1→
Patents
1999
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 1 as inventor

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

E21Bprimary
E21BEarth or rock drilling100%
PatentTitleYear
5,865,261'Balanced or underbalanced drilling method and apparatus'1999

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1999Patents assigned to BAKER HUGHES INC (1)· patent assignee history
1999Based in Calgary, CA· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
BAKER HUGHES INC11999
Locations
LocationPatentsSpan
Calgary, CA11999