Frederik van Dongen

Follow

Person

Eindhoven, NL

People

Patents Grantslast 30 patents

Information Patent Grant
Electronic telephone set
- Patent number 4,953,207
- Issue date Aug 28, 1990
- U.S. Philips Corporation
- Frederik Van Dongen
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Telephone set comprising a line voltage stabilizer having a DC supp...
- Patent number 4,811,391
- Issue date Mar 7, 1989
- U.S. Philips Corp.
- Frederik Van Dongen
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Transmission circuit for a DTMF-telephone set
- Patent number 4,585,909
- Issue date Apr 29, 1986
- U.S. Philips Corporation
- Henricus J. M. Otten
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Arrangement for applying a ringing voltage to a subscriber's line
- Patent number 4,370,526
- Issue date Jan 25, 1983
- U.S. Philips Corporation
- Franciscus A. C. M. Schoofs
- H04 - ELECTRIC COMMUNICATION TECHNIQUE