Learn more

GROTHE & SOEHNE KG A

Overview
  • Total Patents
    37
About

GROTHE & SOEHNE KG A has a total of 37 patent applications. Its first patent ever was published in 1968. It filed its patents most often in Germany, EPO (European Patent Office) and Italy. Its main competitors in its focus markets telecommunications, electrical machinery and energy and audio-visual technology are BETULANDER AUTOMATIC TELEPHONE, ET CIE) and PICART LEBAS TELEPHONES.

Patent filings in countries

World map showing GROTHE & SOEHNE KG As patent filings in countries
# Country Total Patents
#1 Germany 27
#2 EPO (European Patent Office) 3
#3 Italy 3
#4 Norway 2
#5 Switzerland 1
#6 Finland 1

Patent filings per year

Chart showing GROTHE & SOEHNE KG As patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Weyel Armin 8
#2 Sella Hans-Adolf 5
#3 Rathgeber Wolfgang 4
#4 Salah Gerd 4
#5 Loedel Guenter 3
#6 Mansel Werner 2
#7 Grothe Carl Dipl Ing 2
#8 Weyel Arnim 2
#9 Grothe Carl Dipl-Ing 2
#10 Boeser Werner 2

Latest patents

Publication Filing date Title
EP0508235A1 Door installation especially door interphone
DE4134044A1 Door system, in particular door intercom
DE4143337A1 Functional unit for a door system
DE4029430A1 Power=pack for entry phone using mains supply - has transformer and rectifier with transistor output stages coupled to microphone and loudspeaker indoor system
DE4019837A1 DOOR SYSTEM, IN PARTICULAR INTERCOM
DE3910851A1 Chime circuit
DE3910879A1 Door station of a house intercom equipped with voice control
DE3910858A1 Switching arrangement for door intercom and door opener systems
DE3513854A1 Hands-free device
DE3513490A1 Bell button
DE3513619A1 Front plate for door stations of a house call system
IT8224358D0 Electronic door chime type circuit
DE3242735A1 Electronic multitone gong
CH656999A5 Circuit arrangement for a hands-free telephone
DE3211184A1 Circuit arrangement for a hands-free telephone
DE3112765A1 Arrangement for driving the IC of an electronic gong
DE3039478A1 DETACHABLE COVER FOR TERMINALS
DE2926054A1 Door communication system using blocking transistor in speech circuit - has only two wires between door unit and centralised circuit and shunt connection for loudspeaker
DE2915774A1 On=off switching for telephone subscriber's appts. with local battery - using mercury switch to automatically switch on microphone and delay switch on amplifier when handset is lifted for use
DE2847022A1 Compact continuity tester with Darlington pair circuit - driving indicator when low impedance is connected between inputs