4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Photocell controls its own optical systems

Jacobus P. J. Heemskerk

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Apparatus for optically scanning an information plane wherein a

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent

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Information carrier containing auxiliary information, reading de

Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent

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Method of hiding areas on a disc like recording of the...

Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate

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Method of preventing recording on a disc like recording...

Dynamic information storage or retrieval – Binary pulse train information signal – Including sampling or a/d converting
Reexamination Certificate

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Method of registering a running time on an information...

Dynamic information storage or retrieval – Binary pulse train information signal – Having specific code or form generation or regeneration...
Reexamination Certificate

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