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Inventor

John M. Clegg

Inventor
Bristol, GB

Overview

15→
Patents
1992–2020
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 15 as inventor

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

E21Bprimary
E21BEarth or rock drilling79%
B24DTools for grinding, buffing or sharpening16%
C04BLime, magnesia5%
PatentTitleYear
10,711,528Diamond cutting elements for drill bits seeded with HCP crystalline material202010,180,032Diamond cutting elements for drill bits seeded with HCP crystalline material201910,160,099Selectively leached, polycrystalline structures for cutting elements of drill bits20187,318,492'Rotary drill bit'20086,089,336'Rotary drill bits'20006,089,332'Steerable rotary drilling systems'20005,819,860'Rotary drill bits'19985,803,185'Steerable rotary drilling systems and method of operating such systems'19985,685,379'Method of operating a steerable rotary drilling system'19975,671,818'Rotary drill bits'19975,553,678'Modulated bias units for steerable rotary drilling systems'19965,244,039'Rotary drill bits'19935,186,268'Rotary drill bits'19935,163,524'Rotary drill bits'19925,119,892'Notary drill bits'1992

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1992–1998Patents assigned to CAMCO DRILLING GROUP LTD (5)· patent assignee history
1992–2000Based in Bristol, GB· patent location history
1992–1998Based in Redland, GB· patent location history
1996–1998Patents assigned to CAMCO INT (2)· patent assignee history
1997Patents assigned to CAMCO DRILLING GROUP LTD OF HY (1)· patent assignee history
2000Patents assigned to CAMCO INT UK LTD (2)· patent assignee history
2008Based in Tewkesbury, GB· patent location history
2018–2020Patents assigned to ULTERRA DRILLING TECH LP (3)· patent assignee history
2018–2020Based in Fort Worth, TX, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
CAMCO DRILLING GROUP LTD51992–1998
ULTERRA DRILLING TECH LP32018–2020
CAMCO INT21996–1998
CAMCO INT UK LTD22000
CAMCO DRILLING GROUP LTD OF HY11997
Locations
LocationPatentsSpan
Bristol, GB71992–2000
Redland, GB41992–1998
Fort Worth, Texas, US32018–2020
Tewkesbury, GB12008