Dynamic information storage or retrieval

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369

SECTION I - CLASS DEFINITION

A. This is the generic class for processes of and apparatus for the storage or retrieval of arbitrarily variable information (as defined in the glossary below) which is retained in a storage medium by variation of a physical characteristic thereof. The information is stored or retrieved by causing or sensing a variation of a physical characteristic of the storage medium by a transducer having relative motion along a continuous path.

(1) Note. The record carrier must have continuous physical extent over the path of movement and be able to store a time-varying information signal. Static or discrete systems are classified elsewhere (see References to Other Classes, below).

(2) Note. The characteristic variation is one which must be retrievable by a transducer. Such variation producing only a directly perceptible indication (e.g., a graph), is classified elsewhere (see References to Other Classes, below).

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Subclass

Title

44.14

Optical head servo system structure

593 Patents

Optical pickup assembly

Universal portable minidisk drive system

Optical data storage technology

Optical pickup device

Pickup head actuator

High density data storage module

Laser module and optical head

Optical system driving apparatus

44.23

Structure for shaping beam or causing astigmatic condition

839 Patents

Optical system for optical head

Optomagnetic recording/reproducing apparatus

Optical pick-up apparatus

Multi-element prism for optical heads

Diffractive optical lens

Optical focussing device

Optical pickup device

Optical head device

275.1

Optical track structure (e.g., phase or diffracting structure, etc.)

708 Patents

Optical recording medium

Information recording methods using lasers

Optical volume memory

Optical recording medium

Optical information recording medium

Protuberant optical recording medium

Phase change optical disc

Optical information reproducing apparatus

Multilayer information disc

Ablative optical recording medium

Multi-layer optical disk

Method of manufacturing magnetic patterns

Method for producing disk-recording plates

275.4

Pit/bubble/groove structure specifies

853 Patents

Optical information recording medium

Data carrier for optical read-out

Mass storage of books

Mobil pre-etched data carrier

Optical information recording medium

Optical recording medium

High density optical disc configuration

Reversible optical information medium

283

Layered (e.g., permanent protective layer)

567 Patents

Optical information recording medium

Rewritable optical information medium

Thin zirconia disk substrate

Mountable disc display device

Optical information recording medium

Magnetooptical recording medium

Information recording medium

Magneto-optical disc

Optical recording medium

Recording media for recordable element

Optical recording medium

Optically recordable carrier

Disc protection structure

Optical recording medium

284

Radiation beam modified or controlling (e.g., photosensitve, optical track)

420 Patents

Write-once-read-many optical disk

Information recording material

Protuberant optical recording medium

Information recording medium

Information recording medium

Organic-optic recording tapes

Optical recording medium

Optical information recording medium

Optical recording medium

Protuberant optical recording medium

Metallized information carrying discs

Optical card of closed type

Recording method and apparatus

Fluorescent optical memory

Disk unit with retaining ring

Optical recording disk

288

Specified material

850 Patents

Optical recording medium

Optical recording medium

Magnetic recording medium

Optical information recording medium

Optical disk substrate

High-density information disc lubricant

Optical recording medium

Optical recording medium

Information recording medium

Optical memory element

Information recording medium

High density information disc lubricants

Optical recording medium

1

COMBINED INDEPENDENT AUDIO SYSTEMS

32 Patents

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2

Changeover between audio systems

83 Patents

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3

Fading between plural signals

21 Patents

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4

Combining signals to form composite (e.g., mixing)

67 Patents

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5

One of systems having plural concurrent signals (e.g., stereophonic)

21 Patents

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6

Radio

70 Patents

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7

Including recording from radio

75 Patents

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8

Oscillator modulated by retrieved information signal

1 Patent

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9

Mechanical phonograph

1 Patent

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10

With common cabinet for cartridge or cassette

32 Patents

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11

Including separable assembly

35 Patents

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12

Cabinet details

38 Patents

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13.01

STORAGE OR RETRIEVAL BY SIMULTANEOUS APPLICATION OF DIVERSE TYPES OF ELECTROMAGNETIC RADIATION

61 Patents

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13.02

Magnetic field and light beam

116 Patents

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13.03

Initializing

17 Patents

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13.04

Erasing

17 Patents

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13.05

Reading

42 Patents

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13.06

By transferring magnetic domain between layers

13 Patents

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