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Inventor

John Powers

Inventor
Menlo Park, CA, US

Overview

5→
Patents
1976–2020
Patent span
Electricity
Primary field (CPC H)

Patents· 5 as inventor

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

F02Bprimary
F02BInternal-combustion piston engines21%
H02KDynamo-electric machines21%
H02PControl or regulation of electric motors, electric generators or dynamo-electric converters21%
H02HEmergency protective circuit arrangements14%
H01HElectric switches7%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems7%
H03KPulse technique7%
PatentTitleYear
10,715,068Auto-braking for an electromagnetic machine202010,554,099DC-DC converter in a non-steady system202010,404,199Auto-braking for an electromagnetic machine20195,195,016'Photoelectric load control system'19933,995,202'Condition-initiated load control circuit'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976Patents assigned to SIGMA INSTRUMENTS INC (1)· patent assignee history
1976–1993Based in East Weymouth, MA, US· patent location history
1993Patents assigned to DARK TO LIGHT INC (1)· patent assignee history
2019–2020Patents assigned to ETAGEN INC (3)· patent assignee history
2019–2020Based in Menlo Park, CA, US· patent location history
2020Patents assigned to MAINSPRING ENERGY INC (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
ETAGEN INC32019–2020
DARK TO LIGHT INC11993
MAINSPRING ENERGY INC12020
SIGMA INSTRUMENTS INC11976
Locations
LocationPatentsSpan
Menlo Park, California, US32019–2020
East Weymouth, Massachusetts, US21976–1993