Inventor

HEEMSKERK JACOBUS P J

19 patents

⚠️ This page may combine multiple inventors who share the name “HEEMSKERK JACOBUS P J”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HEEMSKERK JACOBUS P J

PHILIPS CORP

Information carrier containing auxiliary information, reading device and method of manufacturing such an information carrier

Methods of and information recording devices for recording and/or inhibiting recording of an information signal having copy bits with logic values which alternate in accordance with a pattern

Multi-layer information storage system with improved aberration correction

Optical record carrier and apparatus for reading it

Record carrier with copy bits

Record carrier and apparatus for scanning the record carrier

Multi-layer information storage system with improved aberration correction

Apparatus for optically scanning an information plane wherein a diffraction grating splits the beam into two sub-beams

Optical focussing-error detection system

Optic read unit for scanning a record carrier having a radiation-reflecting information structure

Optical focusing device with two controls

Magneto-optical recorder with servo control system for a magnetic-field modulation system

KONINKL PHILIPS ELECTRONICS NV

Multi-layer optical record carrier not requiring spherical aberration correction

Method of preventing recording on a disc like recording medium of the optically rewritable type

Multi-layer information storage system with focus and radial positioning error detection

Method of hiding areas on a disc like recording of the optically rewritable type

Method of registering a running time on an information carrier, information carrier and apparatus

Method of registering a running time on an information carrier, information carrier and apparatus

Method of registering a running time on an information carrier, information carrier and apparatus