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SELECTRA LTD

Overview
  • Total Patents
    23
About

SELECTRA LTD has a total of 23 patent applications. Its first patent ever was published in 1950. It filed its patents most often in United Kingdom, Canada and France. Its main competitors in its focus markets electrical machinery and energy and mechanical elements are CARRARO DIEGO, SOFTWARE MOTOR CORP and COELNER ELEKTROMOTORENFABRIK J.

Patent filings in countries

World map showing SELECTRA LTDs patent filings in countries
# Country Total Patents
#1 United Kingdom 11
#2 Canada 4
#3 France 3
#4 Spain 2
#5 Austria 1
#6 Switzerland 1
#7 United States 1

Patent filings per year

Chart showing SELECTRA LTDs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Krebs Ernst W 3
#2 Krebs Ernst Wolfgang 3
#3 Ernst Wolfgang Krebs 1
#4 Krebs Ernest W 1
#5 Wolfgang Krebs Ernst 1

Latest patents

Publication Filing date Title
FR89346E Improvements to self-exciting and self-regulating synchronous electric machines
ES310518A1 Improvements in synchronized dinamoelectric machines. (Machine-translation by Google Translate, not legally binding)
GB1100907A Improvements relating to brushless alternators
FR1403079A Improvements to self-exciting and self-regulating synchronous electric machines
FR1352045A Static excitation circuit for synchronous alternators with automatic regulation
GB1045573A Improvements relating to the excitation and control of dynamo-electric generators
GB921613A Improvements relating to continuously-variable-ratio gears
GB929120A Means for initiating the direct current excitation of self-excited dynamo-electric machines
GB888685A Improvements relating to electric induction motors
GB771223A Improvements relating to heteropolar inductor machines
GB765588A Improvements relating to heteropolar inductor alternators
GB756495A Improvements relating to dynamo electric machines of the heteropolar inductor type
GB718728A Improvements relating to dynamo-electric machines
GB719267A Improvements relating to synchronous dynamo-electric machines
GB719212A Improvements relating to synchronous dynamo-electric machines
CA811822A Self excited brushless alternators and their control
CA649652A Means for initiating the direct current excitation of self-excited dynamo-electric machines
CA683320A Excitation and control of dynamo-electric generators
CA599900A Heteropolar inductor machines