Inventor · disambiguated record
Christiaan H. F. Velzel
Also filed as: VELZEL CHRISTIAAN H F · VELZEL CHRISTIAAN HENDRIK FRAN
8 granted patents·163 citations·filing 1974–1995
88Inventor score
Files withPHILIPS CORP7
Top patents by PatentIndex Score
8 records- 0187US4074314AApparatus for optically reading a record carrier and correcting focus errorPHILIPS CORP·Filed 1976·Granted Feb 14, 1978·30 cites·1 claims
- 0286US4850673AOptical scanning apparatus which detects scanning spot focus errorPHILIPS CORP·Filed 1988·Granted Jul 25, 1989·46 cites·5 claims
- 0379US3992575AApparatus for optically reading a record carrier by means of an autofocus devicePHILIPS CORP·Filed 1974·Granted Nov 16, 1976·17 cites·5 claims
- 0477US3999008ARecord carrier on which information is stored in an optically readable structure with dither focussing signals also being storedPHILIPS CORP·Filed 1974·Granted Dec 21, 1976·16 cites·3 claims
- 0575US4800547AOptical record carrier scanning apparatus with scanning beam focus error detectionPHILIPS CORP·Filed 1986·Granted Jan 24, 1989·26 cites·7 claims
- 0650US4427261AOptical transmission system having reduced modal noisePHILIPS CORP·Filed 1981·Granted Jan 24, 1984·9 cites·2 claims
- 0745US5144131ADevice for optically scanning an information plane detecting border portions of light beamPHILIPS CORP·Filed 1991·Granted Sep 1, 1992·7 cites·20 claims
- 0837US5995227AMethod and interference microscope for microscoping an object in order to obtain a resolution beyond the diffraction limit (high resolution)Filed 1995·Granted Nov 30, 1999·12 cites·13 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →