Inventor

Kenneth Roderick Stewart

Inventor

Aberdeen, GB

Overview

12→

Patents

1998–2014

Patent span

Fixed constructions

Primary field (CPC E)

Patents· 12 as inventor

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

E02Fprimary

E02FDredging18%

E21BEarth or rock drilling18%

F03BMachines or engines for liquids11%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests11%

E02BHydraulic engineering7%

F05BIndexing scheme relating to wind, spring, weight, inertia or like motors, to machines or engines for liquids covered by subclasses f03b, f03d and f03g7%

Y02EReduction of greenhouse gas [ghg] emissions, related to energy generation, transmission or distribution7%

B63GOffensive or defensive arrangements on vessels4%

E21CMining or quarrying4%

F01DNon-positive displacement machines or engines, e.g. steam turbines4%

PatentTitleYear

8,893,408'Underwater excavation apparatus'2014 8,800,176'Underwater excavation apparatus'2014 7,944,073'Power generator and turbine unit'2011 7,768,145'Power generator and turbine unit'2010 7,686,075'Downhole pump assembly and method of recovering well fluids'2010 6,854,953'Speed governor'2005 6,581,690'Window cutting tool for well casing'2003 6,527,513'Turbine for down-hole drilling'2003 6,430,848'Underwater excavation apparatus'2002 6,178,670'Underwater mining apparatus'2001 6,053,663'Device for creating a local water flow'2000 5,833,444'Fluid driven motors'1998

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1998–2014Based in Aberdeen, GB· patent location history

2001–2011Patents assigned to ROTECH HOLDINGS LTD (8)· patent assignee history

2005Based in Blairs, GB· patent location history

2014Patents assigned to ROTECH LTD (2)· patent assignee history

2014Patents assigned to STEWART KENNETH RODERICK (2)· patent assignee history

2014Patents assigned to STEWART DONALD (1)· patent assignee history

2014Patents assigned to SUSMAN HECTOR FILIPPUS ALEXANDER VAN DRENTHAM (1)· patent assignee history

2014Based in Aberdeenshire, GB· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
ROTECH HOLDINGS LTD	8	2001–2011
ROTECH LTD	2	2014
STEWART KENNETH RODERICKself	2	2014
STEWART DONALD	1	2014
SUSMAN HECTOR FILIPPUS ALEXANDER VAN DRENTHAM	1	2014

Locations

Location	Patents	Span
Aberdeen, GB	10	1998–2014
Aberdeenshire, GB	1	2014
Blairs, GB	1	2005