Inventor

SPRUIT JOHANNES H M

NL41 patents

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

SPRUIT JOHANNES H M

PHILIPS CORP

Modifying the recording process to extend the life of a rewritable information carrier

Optical record carrier and method and apparatus for increasing the resolution of information recorded thereon and read therefrom

Display tube provided with an interference filter

Optical record carrier

Write intensity calibration of a recording beam by reading a test pattern written on a buffer sector of a record carrier

Display tube having improved brightness distribution

Projection television display tube and device having interference filter

Method and device for writing optical record carriers

Optical recording medium with recording control information

Method and device for recording a mark having a substantially constant number of pulses per unit length independent of writing speed on an optical information carrier

Display tube having a display window with an interference filter

Information carrier, reading/writing device and reading device for writing and/or reading information blocks

Information carrier, reading/writing device and reading device for writing and/or reading information blocks

Magneto-optical recording method and magneto-optical recording apparatus

Optical record carrier with grooves having wobbles with phases depending on position information pits at predetermined positions

Optical recording medium

Apparatus for writing and reading a magneto-optical record carrier

Direct over-write magneto-optical recording medium having multiple recording layers, and method of recording new information by directly overwriting pre-existing recorded information on such medium

Method of and apparatus for writing and reading a magneto-optical record carrier with an information density greater than that corresponding to the size of the scanning spot

Method of recording information on a record carrier of the thermomagnetic type, and device for carrying out the method

Method and apparatus for writing and reading a magneto-optical record carrier

Three tube color projection television system having multispot blue tube and single-spot red and green tubes

Magneto-optical record carrier with recording track structure suited for high density recording

Projection television display device

KONINKL PHILIPS ELECTRONICS NV

Record carrier, playback device and method of recording information

Record carrier and apparatus for scanning the record carrier

Varying the process of rewriting to extend the life of a information carrier

Record carrier and apparatus for scanning the record carrier

Method and device for recording information in linking block units

Record carrier, playback device and method of recording information

Method and device for recording information in units

Methods of determining the optimal erase and write power, and recording apparatus with devices for said methods

Optical recording method and apparatus using this method

Information carrier with a compact header format and apparatus

Methods of determining the optimal erase and write power, and recording apparatus with devices for said methods

Optical disc and apparatus for scanning the optical disc

Optical disc and apparatus for scanning the optical disc

SPRUIT JOHANNES H M

Method and device for retrieving information from an optical record carrier at various reading speeds

Record carrier, playback device and method of recording information

KONINK PHILIPS ELECTORNICS N V

Method and device for recording information in units

KOININKLIJKE PHILIPS ELECTRONI

Method and device for recording information in units