# US 4,400,245 A · Matrixing process for the manufacture of molded records

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- Number: US 4,400,245 A
- Document ID: US4400245A
- Status: Granted
- Kind: A
- Application number: 06/325,995
- Filed: 1981-11-30
- Granted: 1983-08-23
- Earliest claimed: 1981-11-30
- Assignees: RCA Corporation
- Inventors: John J. Prusak
- Web page: https://patentgrep.com/patent/US4400245A

## CPC

- C25D 1/10: Moulds; Masks; Masterforms
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR

## Abstract

A process improvement is disclosed for use in the matrixing process employed in the manufacture of molded records. In accordance with the disclosure, a narrow texturized band is provided in either the outer or inner unrecorded areas of a matrix or in both areas of a matrix, so that when a replica is electroformed on the matrix the texturized bands will provide sufficient additional grip of the replica to the matrix to prevent premature separation.

## Claims

### Claim 1

In the matrixing process employed in the manufacture of molded records in which a flat matrix having a surface comprised of a flat unrecorded bright metal circumferential outer-most zone, an adjacent intermediate recorded zone containing an information track, and an inner unrecorded bright metal zone is electroformed with a metal on said surface to form a replica thereon: the improvement which comprises: texturizing a circumferential portion of at least one of the unrecorded bright metal zones to provide a circular texturized band of sufficient roughness to prevent premature separation of the replica from the surface of the matrix.

### Claim 2 (depends on 1)

The improvement according to claim 1 wherein the texturized band is of sufficient roughness to be observed on the bright metal zone with the unassisted eye.

### Claim 3 (depends on 1)

The improvement according to claim 1 wherein the texturized band is applied in the flat outer-most zone.

### Claim 4 (depends on 1)

The improvement according to claim 1 wherein texturized bands are applied in both the inner and outer-most zones.

### Claim 5 (depends on 1)

The improvement according to claim 1 wherein the texturized band is about 1/8 of an inch (3.175 mm) in width.

### Claim 6 (depends on 1)

The improvement according to claim 1 wherein the texturized band is applied in an area outside of the molding area of a stamper to be derived from the replica.