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Inventor

Allan T. Johns

Inventor
Swindon, GB

Overview

8→
Patents
1981–1998
Patent span
Electricity
Primary field (CPC H)

Patents· 8 as inventor

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

H02Hprimary
H02HEmergency protective circuit arrangements70%
G01RMeasuring electric variables30%
PatentTitleYear
5,825,189'Method of locating the position of a fault on a power transmission'19985,796,257'Detecting faults in power lines'19985,072,403'Equipment for and methods of locating the position of a fault on a power transmission line'19914,922,368'Method and apparatus for detecting and discriminating faults in transmission circuits'19904,782,421'Electrical supply line protection apparatus'19884,617,636'Protection of electrical power supply systems'19864,352,137'Methods and apparatus for fault detection'19824,261,038'Protection of electrical power supply systems'1981

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1981–1990Patents assigned to NAT RES DEV (4)· patent assignee history
1981–1988Based in Corsham, GB· patent location history
1982Patents assigned to GEN ELECTRIC CO LTD (1)· patent assignee history
1990–1998Based in Swindon, GB· patent location history
1991–1998Patents assigned to GEC ALSTHOM LTD (2)· patent assignee history
1998Patents assigned to UNIV BATH (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
NAT RES DEV41981–1990
GEC ALSTHOM LTD21991–1998
GEN ELECTRIC CO LTD11982
UNIV BATH11998
Locations
LocationPatentsSpan
Swindon, GB41990–1998
Corsham, GB41981–1988