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LUDLUM STEEL COMPANY

Overview
  • Total Patents
    26
About

LUDLUM STEEL COMPANY has a total of 26 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 materials and metallurgy, machines and machine tools are THOS FIRTH & JOHN BROWN LTD, CRUCIBLE STEEL CO AMERICA and BOEHLER BLECHE GMBH.

Patent filings in countries

World map showing LUDLUM STEEL COMPANYs patent filings in countries
# Country Total Patents
#1 United States 26

Patent filings per year

Chart showing LUDLUM STEEL COMPANYs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Armstrong Percy A E 16
#2 De Vries Ralph P 9
#3 De Fries Henry A 7
#4 Homerberg Victor O 1

Latest patents

Publication Filing date Title
US1941203A Method of improving the mechanical workability of high chrome steels
US1941202A Alloy steel
US1799273A Alloy steel containing nickel, silicon, and copper
US1927819A Alloying
US1775339A Manufacture of irons and steels
US1723015A Molybdenum nitriding steels and process of nitriding same
US1718685A Ferro-aluminum alloy and method of making it
US1712030A Stable-surface alloy steel resistant to acids
US1759606A Stable-surface alloy steel
US1839089A Stable surface alloy steel
US1788281A Stable-surface alloy steel
US1686223A Stable-surface iron-chromium-silicon alloy
US1826860A Process of making products with welded faces of stable surface alloy
US1557132A Process and product of making low-carbon chromium-iron alloys
US1533782A Valve for internal-combustion engines
US1554615A Article resistant to food acids and process of making same
US1468937A Alloy steel and articles made therefrom
US1495504A Heat-resisting articles of alloy steel
US1718210A Process of making hollow drill rods
US1757790A Process of making reenforced noncorrosive steel