# US 4,400,457 A · Dual layer record element and method

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- Number: US 4,400,457 A
- Document ID: US4400457A
- Status: Granted
- Kind: A
- Application number: 06/322,758
- Filed: 1981-11-19
- Granted: 1983-08-23
- Earliest claimed: 1981-11-19
- Inventors: Reynold B. Johnson
- Web page: https://patentgrep.com/patent/US4400457A

## CPC

- G03C 5/14: combined with sound-recording (sound-recording in general G11B)
- G11B 5/70: on a base layer
- Y10S 428/90: Magnetic feature
- Y10S 430/136: Coating process making radiation sensitive element
- G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G)
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A method of making a dual layer record element for photographically and magnetically recording information respectively on opposite faces thereof and product.

## Claims

### Claim 1

A record element comprising a maximum of two layers of matter, one layer being formed from a mixture of magnetic and resin materials to provide a self-supporting layer, and a second layer forming a coating of photoresponsive chemical material applied to one side of said one layer, said mixture including sufficient magnetic material to cause said one layer to be sufficiently opaque to prevent exposure of said coating to light passing through said layer so as to permit said element to record information thereon both photographically and magnetically.

### Claim 2

A method of forming an elongate web of material for magnetically and photographically recording information thereon respectively on opposite faces thereof comprising the steps of casting a mixture of resin and sufficient magnetic material to form a self-supporting web thereof opaque to visible light, and in darkness passing one face of said web across and in contact with the surface of a body of photoresponsive chemical material to coat one side of said web.

### Claim 3

A method of forming an elongate web of material for magnetically and photographically recording information thereon respectively on opposite faces thereof comprising the steps of forming a fluid body of resin and magnetic material, rotating a smooth cylindrical surface to pass into and out of said body in a manner applying a sufficient amount of material from said body to said surface to form a self-supporting web thereof, peeling the applied material from said surface to form said web thereof, and passing one face of said web across the surface of and in contact with a body of photoresponsive material to coat one side of said web therewith, said fluid body having sufficient magnetic material therein to cause said web to be sufficiently opaque to preclude exposure of the coated side of said web to light passing through said web.

### Claim 4

A method of forming a length of elongate record material having a maximum of two layers starting with a self-supporting length of magnetic material formed as a maximum of one layer to provide a web thereof, said layer having sufficient magnetic material therein to cause said layer to be opaque to visible light, and including the further steps of passing one face of said web across the surface of and in contact with a body of photoresponsive material to coat one side of said web to provide a second layer carried by said one layer.

### Claim 5

A roll of opaque, magnetic, photointeractive material comprising a mixture of magnetic and resin materials formed as a self-supporting layer of said mixture, and a coating of photointeractive material applied to one side thereof, said mixture including sufficient magnetic material to cause said layer to be sufficiently opaque to prevent exposure of said coating through said layer.