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HOWSON ALGRAPHY LTD

Overview
  • Total Patents
    154
About

HOWSON ALGRAPHY LTD has a total of 154 patent applications. Its first patent ever was published in 1967. It filed its patents most often in United Kingdom, United States and Germany. Its main competitors in its focus markets optics, textiles and paper and macromolecular chemistry and polymers are FLINT GROUP GERMANY GMBH, POLYFIBRON TECHNOLOGIES INC and POLYCHROME CORP.

Patent filings per year

Chart showing HOWSON ALGRAPHY LTDs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Lawson Leslie Edward 17
#2 Smith Peter John 13
#3 Watkinson Leonard James 11
#4 Smith Frank Edward 9
#5 Lawson L 8
#6 Lawson L E 7
#7 Watkinson L 7
#8 Watkinson L J 6
#9 Crafts Robert Charles 5
#10 Gates A 5

Latest patents

Publication Filing date Title
KE2682A Improvements in or relating to printing plates
US4052217A Bimetallic lithographic printing plates
GB1482351A Printing plates
US3890148A Exposure of light-sensitive materials
US3865595A Lithographic printing plates
CA989232A Lithographic printing plates
ZA7207894B Improvements in or relating to lithographic printing plates
US3843603A Light-sensitive polymeric esters containing azido substituted styryl groups
AU4626972A Cleansing of surfaces
DK142558B Positive-acting photosensitive mixture for use in photomechanical processes and processes for its preparation.
ZA7204004B Improvements in or relating to light sensitive materials
US3814608A Contact screens
FR2131355A6 Lithographic plate - contg diazo cpd plus hardenable acrylamide /acrylonitrile/acrylic acid copolymer resistant to treatment solns
AU3911272A Improvements in or relating to lithographic printing plates
ZA7200261B Improvements in or relating to the cleansing of surfaces
GB1377747A Light sensitive materials
DE2141978A1 Gram scale - to control exposure and developing of light sensitive material, using matt polyethylene terephthalate film
GB1364624A Simulated continous tone step wedges
GB1347759A Light sensitive materials
GB1338478A Contact screens