Inventor

John David Wallace

Inventor

Malmesbury, GB

Overview

1983–2019

Patent span

Mechanical engineering

Primary field (CPC F)

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

F04Dprimary

F04DNon-positive-displacement pumps16%

F04FPumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped16%

F24HFluid heaters, e.g. water or air heaters, having heat-generating means, e.g. heat pumps, in general16%

F24FAir-conditioning14%

A61LMethods or apparatus for sterilising materials or objects in general5%

G03FPhotomechanical production of textured or patterned surfaces, e.g. for printing, for processing of semiconductor devices5%

H01QAntennas, i.e. radio aerials5%

LOC233%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests3%

A47BTables2%

PatentTitleYear

Assembled from patent assignee/location history and declaration credentials.

1991–1994Patents assigned to C & K SYSTEMS INC (2)· patent assignee history

1992–1999Based in Newburyport, MA, US· patent location history

1998–2006Based in Fremont, CA, US· patent location history

2011–2018Based in Malmesbury, GB· patent location history

2012–2019Patents assigned to DYSON TECHNOLOGY LTD (10)· patent assignee history

2012–2014Patents assigned to WALLACE JOHN DAVID (6)· patent assignee history

2012–2014Patents assigned to CHOONG CHANG HIN (4)· patent assignee history

2012–2014Patents assigned to DYSON JAMES (2)· patent assignee history

2015–2019Based in Singapore, SG· patent location history

2018Based in Los Gatos, CA, US· patent location history

Assignee and location history derived from the patent record.

Assignees

Locations

Location	Patents	Span
Malmesbury, GB	8	2011–2018
Singapore, SG	3	2015–2019
Fremont, California, US	3	1998–2006
Newburyport, Massachusetts, US	3	1992–1999
Los Gatos, California, US	1	2018