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DONALD WELLS HAROLD

Overview
  • Total Patents
    15
About

DONALD WELLS HAROLD has a total of 15 patent applications. Its first patent ever was published in 1919. It filed its patents most often in United States. Its main competitors in its focus markets textiles and paper, machines and environmental technology are NOBLE & WOOD MACHINE CO, BOLTON JOHN W & SONS INC and SHARTLE CHARLES W.

Patent filings in countries

World map showing DONALD WELLS HAROLDs patent filings in countries
# Country Total Patents
#1 United States 15

Patent filings per year

Chart showing DONALD WELLS HAROLDs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Donald Wells Harold 15

Latest patents

Publication Filing date Title
US2544971A Paper stock refining machine
US2424726A Pulp beater and selector
US2434449A Continuous pulper and selector
US2351728A Continuous beater and pulp selector
US2340720A Pulp beater and selector
US2356289A Pulp screen
US2289612A Continuous beater and pulp selector
US2027660A Freeness detector
US2055956A Pulp hydrator
US2083884A Wastepaper de-inking and de-fibering process and apparatus
US1951684A Continuous pulp selector
US1897157A Paper stuff hydrator
US1862643A Proportioning and metering apparatus
US1890799A Paper stock regulator
US1346690A Screening or filtering apparatus