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Inventor

David England

Inventor
Bristol, GB

Overview

4→
Patents
1985–2021
Patent span
Performing operations
Primary field (CPC B)

Patents· 4 as inventor

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

B23Hprimary
B23HWorking of metal by the action of a high concentration of electric current on a workpiece using an electrode which takes the place of a tool40%
G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein40%
B60JWindows, windscreens, non-fixed roofs, doors, or similar devices for vehicles20%
PatentTitleYear
11,079,650Temperature control for electrochromic devices202110,331,003Electrochromic privacy window20195,004,528'Method and apparatus for electro chemical machining'19914,545,874'Electro chemical machining'1985

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1985Patents assigned to ROLLS ROYCE (1)· patent assignee history
1985–1991Based in Bristol, GB· patent location history
1991Patents assigned to ROLLS ROYCE PLC (1)· patent assignee history
2019–2021Patents assigned to HELIOTROPE TECH INC (2)· patent assignee history
2019Based in Alameda, CA, US· patent location history
2021Based in Warrington, GB· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HELIOTROPE TECH INC22019–2021
ROLLS ROYCE11985
ROLLS ROYCE PLC11991
Locations
LocationPatentsSpan
Bristol, GB21985–1991
Warrington, GB12021
Alameda, California, US12019