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DERRIMAN WALTER HOWLEY

Overview
  • Total Patents
    13
About

DERRIMAN WALTER HOWLEY has a total of 13 patent applications. Its first patent ever was published in 1911. It filed its patents most often in United Kingdom. Its main competitors in its focus markets audio-visual technology, telecommunications and basic communication technologies are DAHLBERG ELECTRONICS, FARRAND INDUCTOR CORP and TYMPHANY CORP.

Patent filings in countries

World map showing DERRIMAN WALTER HOWLEYs patent filings in countries
# Country Total Patents
#1 United Kingdom 13

Patent filings per year

Chart showing DERRIMAN WALTER HOWLEYs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Derriman Walter Howley 13

Latest patents

Publication Filing date Title
GB191328838A Improvements in or relating to Telephone or like Instruments.
GB191321525A Improvements in or relating to Sound Reproducing Apparatus.
GB191315748A Improvements in or relating to Telephone Systems.
GB191315783A Improvements in or relating to Sound Transmitting Apparatus.
GB191226781A Improvements in or relating to Sound Reproducing and Transmitting Apparatus.
GB191226782A Improvements in or relating to Telephone Systems.
GB191200687A Improvements in or relating to Telephone Systems.
GB191121813A Improvements in or relating to Microphones.
GB191121815A Improvements in or relating to Telephone Systems.
GB191121812A Improvements in or relating to Telephone Instruments.
GB191121814A Improvements in or relating to Telephone or like Instruments.
GB191215135A Improvements in or relating to Telephone Systems.
GB191113613A Improvements in or relating to the Production of Dry Heated Air.