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JOHN DOUGLAS ROBERTSON

Overview
  • Total Patents
    27
About

JOHN DOUGLAS ROBERTSON has a total of 27 patent applications. Its first patent ever was published in 1943. It filed its patents most often in United Kingdom, Germany and United States. Its main competitors in its focus markets chemical engineering, packaging and shipping and textiles and paper are WITTLER & CO H, ERHARDT & LEIMER OHG and CORINO MACCHINE S R L.

Patent filings in countries

World map showing JOHN DOUGLAS ROBERTSONs patent filings in countries
# Country Total Patents
#1 United Kingdom 16
#2 Germany 8
#3 United States 3

Patent filings per year

Chart showing JOHN DOUGLAS ROBERTSONs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Dean Walter Edward 4
#2 Robertson John Douglas 3
#3 Murray Walter Peter 2
#4 Dean Walter E 2
#5 Broomfield John L 2
#6 Robinson John Douglas 1
#7 Jr George Bacon Wood 1
#8 Guillemette Delphis Victor 1
#9 Jun George Bacon Wood 1
#10 Wood Jr George B 1

Latest patents

Publication Filing date Title
GB816491A Improvements in apparatus for detecting weft abnormalities in woven materials
GB791577A Improvements in accumulating apparatus for flexible continuous webs
GB795024A Improvements in method and apparatus for twist detection and detwister control
GB789776A Improvements in web material accumulating apparatus
GB770926A Improvements in web guiding apparatus
GB766294A Improvements in apparatus for de-clogging woven fabric or perforated conveyor belts
GB754923A Improvements in weft-straightening apparatus
GB756136A Improvements in curved rolls transversely stretching web materials
GB761830A Improvements in tension responsive control apparatus for weft-straighteners
US2759324A Method and apparatus for twist detection and detwister control
GB754967A Rolls for expanding and contracting web material
US2708785A Curved expander rolls
GB706230A Improvements in curved expander rolls
GB695163A Improvements in expander and contractor rolls for flexible sheet material
GB736674A Improvements in rolls for transversely stretching or contracting webs
US2722415A Sheet guiding apparatus
GB689177A Improvements in apparatus for straightening bowed weft threads in textile fabrics
GB586575A Improvements in weft straightening method and apparatus