Inventor · disambiguated record
Frederik Van Dongen
Also filed as: VAN DONGEN FREDERIK
4 granted patents·19 citations·filing 1981–1989
70Inventor score
Technology areasH04M
Files withPHILIPS CORP4
Top patents by PatentIndex Score
4 records- 0159US4370526AArrangement for applying a ringing voltage to a subscriber's linePHILIPS CORP·Filed 1981·Granted Jan 25, 1983·13 cites·3 claims
- 0227US4811391ATelephone set comprising a line voltage stabilizer having a DC supply pointPHILIPS CORP·Filed 1987·Granted Mar 7, 1989·2 cites·1 claims
- 0327US4585909ATransmission circuit for a DTMF-telephone setPHILIPS CORP·Filed 1984·Granted Apr 29, 1986·2 cites·6 claims
- 0423US4953207AElectronic telephone setPHILIPS CORP·Filed 1989·Granted Aug 28, 1990·2 cites·11 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →