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MERK AG TELEFONBAU FRIEDRICH

Overview
  • Total Patents
    167
About

MERK AG TELEFONBAU FRIEDRICH has a total of 167 patent applications. Its first patent ever was published in 1927. It filed its patents most often in Germany, Austria and France. Its main competitors in its focus markets telecommunications, basic communication technologies and electrical machinery and energy are TN, ELEKTROMECHANISCHE TELEPHONAPP and SIEMENS BROS & CO LTD.

Patent filings in countries

World map showing MERK AG TELEFONBAU FRIEDRICHs patent filings in countries
# Country Total Patents
#1 Germany 161
#2 Austria 2
#3 France 2
#4 Spain 1
#5 United Kingdom 1

Patent filings per year

Chart showing MERK AG TELEFONBAU FRIEDRICHs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Heim Dipl-Ing Friedrich 40
#2 Frank Dipl-Ing Guido 33
#3 Onciul Dipl-Ing Traian 23
#4 Rofler Leonhard 15
#5 Wagner Rudolf 11
#6 Balleis Karl 10
#7 Hoersgen Manfred 7
#8 Roemisch Dipl-Ing Hilmar 7
#9 Wolf Heinz 7
#10 Ruedel Peter 7

Latest patents

Publication Filing date Title
DE1232364B Announcement device with endless sound carrier
DE1243730B Centrifugal brake, especially for pulse generators in self-dialing systems
DE1234275B Circuit arrangement for advancing charge indicators at telecommunication, in particular telephone stations
DE1211279B Circuit arrangement for monitoring individual multi-digit codes in telecommunication systems, in particular telephone branch systems
DE1240922B Circuit arrangement for generating bounce-free pulses
DE1228671B Circuit arrangement for recognizing a loop asymmetry
DE1233445B Circuit arrangement for a relayless subscriber circuit
DE1215215B Electronic follow-up mechanism for monitoring single-digit and multi-digit codes in telecommunications, in particular telephone extension systems, represented by pulse trains
DE1228675B Circuit arrangement for receiving and forwarding loop current changes from connection lines in telecommunication systems, in particular telephone line systems with locking devices
DE1233025B Circuit arrangement for partially electronic small private branch exchanges with an exchange line and an internal connection network
DE1214747B Telephone toll meter
DE1217457B Circuit arrangement for switching on and off electromagnetic display elements at operator stations of telecommunication systems, in particular telephone systems
DE1225711B Circuit arrangement for the transmission of ringing current by means of number switch actuation
DE1238965B Circuit arrangement for an electronically controlled telephone exchange
DE1216945B Circuit arrangement for advancing fee counters located at subscriber stations of telephone systems
DE1213005B Device for recording and reproducing telephone dialing pulses on a cylindrical recording medium
DE1232612B Monostable multivibrator
DE1202839B Circuit arrangement for the delayed forwarding of signals in electronically controlled telecommunications switching systems, in particular telephone branch exchange systems
DE1210460B Circuit arrangement for relay couplers in telecommunications, especially telephone systems
DE1228315B Circuit arrangement for telephone PBXs with several intercom stations that can be connected to the same line