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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 4747093 | Disc-shaped information carrier and method of manufacturing it The invention relates to disc-shaped information carriers which can be read optically in reflection and which contain an annular information zone which is bounded by a concentric inner zone and a concentric outer zone. The information carrier consists of ... | 05/24/1988 |
| 4744074 | Disk-type recording medium A disk-type recording medium having circular or spiral tracks storing information. The tracks are radially and regularly spaced from one another. Each track has pregrooves (2), ridges, or protrusions, and discrete depressions (7,9), ridges, or protrusions... | 05/10/1988 |
| 4726006 | Disc-shaped information carrier and method of manufacturing it The invention relates to disc-shaped information carriers which can be read optically in reflection and which contain an annular information zone which is bounded by a concentric inner zone and a concentric outer zone. The information carrier consists of ... | 02/16/1988 |
| 4710913 | Optical recording disc An optical recording disc comprises a first bonding recess formed near an outside surface of an optical recording disc in a bonding boundary portion between a cylindrical hub and a transparent disc substrate, a disc member bonded with said transparent dis... | 12/01/1987 |
| 4704650 | Oriented sheet supports in a recording disc A recording disc in which two recording sheets are bonded to bonding rings at the inner and outer periphery on both sides of a circular substrate with a recess between the recording portion of the recordings sheets and the substrate. The sheets are formed... | 11/03/1987 |
| 4675768 | Flexible magnetic disk having an embossed circular hole A flexible magnetic disk comprises a jacket and a flexible magnetic disk sheet housed in the jacket. The flexible magnetic disk sheet is provided at the center with a circular hole for engagement with a sheet positioning member of an information writing a... | 06/23/1987 |
| 4641152 | Fixturing apparatus for vibration dampened optical disc recording Apparatus for fixturing an optical recording disc in a DRAW recording machine comprising a hub having a conical shoulder for receiving and locating the disc center opening, and an axially facing shoulder for nesting support of the recording disc. A retain... | 02/03/1987 |
| 4633458 | Disc-shaped, optically-readable information carrier having a protective edge and/or center part High storage density, optically-readable information carriers not only require a read-out side free of contaminants or dust for a faultless reading, but must also be protected against unintentional scratching when being handled on this side. For protectio... | 12/30/1986 |
| 4623570 | Stable stretched surface recording medium Stretched surface recording disk (SD) 10 comprises an annular support 12 having raised annular ridges 42 and 28 at its inside and outside diameters 22 and 30 with a base portion 24 in between the two ridges, and an annular recording medium film 14 held in... | 11/18/1986 |
| 4622661 | Optically readable storage disc An interchangeable optically readable storage disk has a substrate with a recording surface, and a cover thereon which may comprise a second substrate with a further recording layer. The disk includes a protecting arrangement at the circumference of the s... | 11/11/1986 |
| 4577756 | Protective canister for computer discs A protective canister for computer discs comprises a hollow tube and a pair of end caps for closing the tube and fixing a central post therein. A stack of alternate computer discs and spacers having aligned central apertures is loaded onto the center post... | 03/25/1986 |
| 4546464 | Method of manufacturing an optical recording/reproducing disc An optical recording/reproducing disc is formed of round plastic plates between which is a recording layer capable of optically recording and reproducing signals, and a round protective layer of plastic material provided on the recording layer and having ... | 10/08/1985 |
| 4538258 | Record A record (12) comprising a convex protrusion (12a) at its center, one or more protrusions (12b) extending perpendicularly from the plane of the record at its circumferential edge, and a recording area between the center and the circumferential edge. The p... | 08/27/1985 |
| 4385303 | Optical recording and reproducing disc An optical recording and reproducing disc for recording and/or reproducing information by the application of laser beams having a wavelength λ in the range of 0.7 to 1.0 μm, the disc being constituted by a disc-shaped base having at least one spiral gui... | 05/24/1983 |
| 4322841 | Playback instrument for an information carrier disc A playback instrument for a record disc, the instrument including a turntable for supporting the disc to be played on which the disc is centered by means of a central bore, is provided with two annular, concentrically disposed, radially spaced flat bearin... | 03/30/1982 |
| 4076256 | Stylus shift mechanism for a phonograph having two concentric records A toy phonograph of the type having an annular outer record, and an inner record arranged concentrically inwardly of the outer record for simultaneous rotation therewith, with the outer record having its grooved top surface disposed slightly higher than t... | 02/28/1978 |
| 4066268 | Disc recording provided with legible matter In the production of disc recordings, the label portion therefor is formed by tracing a pattern of essentially circular grooves or arrays of dots and groove or dot-free areas in the location of the label portion, the grooved areas contrasting visually wit... | 01/03/1978 |
| 4060248 | Playing apparatus, in particular a video player for playing a record which is made of a transparent material and provided with a central hole A playing apparatus, more specifically a video player for playing round records with a central hole, which are made of a transparent material, which records at one side have a transparent surface and at their other side are provided with information track... | 11/29/1977 |
