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MARTIN ROSENFELD

Overview
  • Total Patents
    14
About

MARTIN ROSENFELD has a total of 14 patent applications. Its first patent ever was published in 1934. It filed its patents most often in United Kingdom and Germany. Its main competitors in its focus markets electrical machinery and energy and transport are TRANSFORMATOREN UNION AG, ALBERT F DORMEYER and FREDERICK EDMUND BERRY.

Patent filings in countries

World map showing MARTIN ROSENFELDs patent filings in countries
# Country Total Patents
#1 United Kingdom 13
#2 Germany 1

Patent filings per year

Chart showing MARTIN ROSENFELDs patent filings per year from 1900 to 2020

Focus industries

Top inventors

# Name Total Patents
#1 Rosenfeld Martin 1

Latest patents

Publication Filing date Title
GB740520A Improvements in and relating to continuous regulating transformers
GB671694A Improvements in and relating to stepless regulating transformers
GB660247A Improved electrical contact device for transformers and the like
GB637634A Improvements in and relating to stepless regulating transformers
GB584660A Electrical contact devices for electrical transformers and the like
GB550976A Transformer, choke, reactor and the like having adjustable reactance
GB542265A Improvements in and relating to stray transformers
GB534376A Improvements in and relating to shell-type transformers, chokes, reactors and the like
GB534997A Improvements in and relating to electric contact devices
GB510406A Transformer coils or the like
GB491982A Adjustable stray transformer
GB489095A Regulating transformer
GB490831A Stray transformer for adjusting several circuits without causing humming