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CALLAND WILLIAMS FREDERIC

Overview
  • Total Patents
    16
About

CALLAND WILLIAMS FREDERIC has a total of 16 patent applications. Its first patent ever was published in 1944. It filed its patents most often in United States and United Kingdom. Its main competitors in its focus markets measurement, basic communication technologies and audio-visual technology are LEON BESS, VARELA ARTHUR A and ELECTRONIQUE & RADIO IND.

Patent filings in countries

World map showing CALLAND WILLIAMS FREDERICs patent filings in countries
# Country Total Patents
#1 United States 15
#2 United Kingdom 1

Patent filings per year

Chart showing CALLAND WILLIAMS FREDERICs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Calland Williams Frederic 15
#2 Moody Norman F 2
#3 Llewelyn Arthur I 1
#4 Frank Moody Norman 1

Latest patents

Publication Filing date Title
US2704809A Wireless signalling systems
US2639419A Electronic signal tracking circuits
US2549875A Thermionic valve circuits
US2607913A Radio navigation system
US2559834A Radio scanner control
US2582894A Wireless beacon system
US2490394A Wireless signaling system
US2541627A Wireless signaling system
US2555837A Time base circuit arrangement
US2549874A Electronic relay circuit arrangement
US2592777A Pulse-echo identifying system
GB584329A Improvements in or relating to circuits employing electron discharge devices