LexDanaLexDanabeta
Inventor

R. Lee Colvard

Inventor
Tomball, TX, US

Overview

4→
Patents
1995–2010
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 4 as inventor

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

E21Bprimary
E21BEarth or rock drilling67%
F16KValves17%
Y10TTechnical subjects covered by former us classification17%
PatentTitleYear
7,730,965'Retractable joint and cementing shoe for use in completing a wellbore'20107,503,398'Methods and apparatus for actuating a downhole tool'20097,252,152'Methods and apparatus for actuating a downhole tool'20075,411,049'Valve'1995

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1995Patents assigned to WEATHERFORD US INC (1)· patent assignee history
1995Based in Spring, TX, US· patent location history
2007–2010Patents assigned to WEATHERFORD LAMB (3)· patent assignee history
2007–2010Based in Tomball, TX, US· patent location history
2010Patents assigned to SHELL OIL CO (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
WEATHERFORD LAMB32007–2010
SHELL OIL CO12010
WEATHERFORD US INC11995
Locations
LocationPatentsSpan
Tomball, Texas, US32007–2010
Spring, Texas, US11995