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WILHELM RITZERFELD

Overview
  • Total Patents
    528
About

WILHELM RITZERFELD has a total of 528 patent applications. Its first patent ever was published in 1924. It filed its patents most often in Germany, United Kingdom and United States. Its main competitors in its focus markets textiles and paper, optics and packaging and shipping are RITZERFELD WILHELM, BLOCK & ANDERSON LTD and FRANK R FORD LTD.

Patent filings in countries

World map showing WILHELM RITZERFELDs patent filings in countries
# Country Total Patents
#1 Germany 258
#2 United Kingdom 172
#3 United States 97
#4 Spain 1

Patent filings per year

Chart showing WILHELM RITZERFELDs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Ritzerfeld Wilhelm 191
#2 Ritzerfeld Gerhard 177
#3 Wilhelm Ritzerfeld 97
#4 Gerhard Ritzerfeld 72
#5 Ritzerfield Gerhard 1
#6 Ritzerfeld Elvira-Nee-Weiss 1
#7 Ritzfeld Gerhard 1
#8 Fischer Heinrich 1

Latest patents

Publication Filing date Title
GB1062129A Improvements in or relating to rotary duplicating machines
GB1035733A Improvements in or relating to rotary duplicating machines
DE1196676B Copy set holder for the thermal copying process
DE1190011B Rotary multiplier for printing printing forms on different types of sheets to be printed
GB1046469A Improvements in or relating to rotary duplicating machines
GB972794A Improvements in or relating to rotary duplicating machines,methods of making printedcopies thereby and printing master sheets for use therewith
DE1188623B Rotary multiplier for line or section printing of several printing forms
DE1188622B Rotary multiplier for line and section printing of printing forms
DE1203806B Rotary multiplier for line-by-line and section-wise printing of printing forms attached to a printing drum
DE1195334B Rotary multiplier for printing selected sections from mirror image printing forms on sheets of paper moistened by means of a moistening device, which is effected by swiveling the printing elements against one another in stages
DE1188619B Rotation multiplier for line-by-line and section-wise printing of printing forms attached to a printing drum on sheets, cards or the like.
DE1188618B Rotation multiplier for line-by-line and section-wise printing of printing forms attached to a printing drum on sheets, cards or the like.
DE1196675B Rotation multiplier for line or section printing of printing forms to be colored on sheets, cards or the like.
DE1189563B Rotation multiplier for line-by-line or section-wise printing of printing forms on sheets, cards or the like.
DE1190472B Rotary multiplier for line-by-line and section-wise printing of printing forms attached to a printing drum
DE1193070B Rotation multiplier for printing lines or sections of printing forms attached to a printing drum on sheets, cards or the like.
GB978767A Improvements in or relating to apparatus for use in the preparation of printing master sheets for hectographic or lithographic printing processes
DE1202801B Process for the production of copies or printing forms of a pattern or template or pre-print to be transferred using differentiated heat or infrared radiation in the reflex or fluoroscopic path
GB1015363A Improvements in or relating to the lamination of transparent coverings on to copy sheets
GB1015362A Improvements in or relating to the lamination of transparent coverings onto copy sheets