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RUBEN TUBE COMPANY

Overview
  • Total Patents
    12
About

RUBEN TUBE COMPANY has a total of 12 patent applications. Its first patent ever was published in 1922. It filed its patents most often in United States. Its main competitors in its focus markets electrical machinery and energy, machines and materials and metallurgy are EITEL MCCULLOUGH INC, KING LAB INC and PANEL TECHNOLOGY.

Patent filings in countries

World map showing RUBEN TUBE COMPANYs patent filings in countries
# Country Total Patents
#1 United States 12

Patent filings per year

Chart showing RUBEN TUBE COMPANYs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Samuel Ruben 12

Latest patents

Publication Filing date Title
US1815931A Vacuum tube
US1941493A Light sensitive circuit
US1908792A Thermionic tube and heater element therefor
US1849157A Insulating coating for filaments
US1882449A Electron discharge device
US1829237A Heater element and method of making it
US1807326A Photo-electric cell
US1926407A Filament for heater type vacuum tubes
US1828545A Vacuum tube and its elements
US1828203A Electron discharge tube
US1739044A Method of treating electron-emission elements
US1755272A Vacuum-tube apparatus