Inventor

James David Ratcliffe

Inventor

Farnborough, GB

Overview

1979–2021

Patent span

Fixed constructions

Primary field (CPC E)

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

E21Bprimary

E21BEarth or rock drilling46%

G01LMeasuring force, stress, torque, work, mechanical power, mechanical efficiency, or fluid pressure15%

B01DSeparation8%

G01VGeophysics8%

G02BOptical elements, systems or apparatus8%

H01MProcesses or means, e.g. batteries, for the direct conversion of chemical energy into electrical energy8%

Y02EReduction of greenhouse gas [ghg] emissions, related to energy generation, transmission or distribution8%

PatentTitleYear

Assembled from patent assignee/location history and declaration credentials.

1979Based in Bolton, GB· patent location history

2012–2021Patents assigned to SONDEX WIRELINE LTD (6)· patent assignee history

2012–2015Patents assigned to RATCLIFFE JAMES DAVID (3)· patent assignee history

2012–2015Patents assigned to GILL TIMOTHY (2)· patent assignee history

2012–2021Based in Farnborough, GB· patent location history

2013Patents assigned to BUSS JOHN (1)· patent assignee history

2013Based in Reading, GB· patent location history

2014Patents assigned to BROOM NICHOLAS PETER (1)· patent assignee history

2014–2015Based in Hook, GB· patent location history

Assignee and location history derived from the patent record.

Assignees

Locations