US 12,334,107 B1
Process for the preparation of a phonograph disc
Sabrina Lucibello, Rome (IT); and Giovanni Inglese, Rome (IT)
Assigned to Università degli Studi di Roma “La Sapienza”, Rome (IT)
Appl. No. 18/842,934
Filed by Università degli Studi di Roma “La Sapienza” “LA SAPIENZA”, Rome (IT)
PCT Filed May 11, 2023, PCT No. PCT/IB2023/054865
§ 371(c)(1), (2) Date Aug. 30, 2024,
PCT Pub. No. WO2023/223151, PCT Pub. Date Nov. 23, 2023.
Claims priority of application No. 102022000010328 (IT), filed on May 18, 2022.
Int. Cl. G11B 11/16 (2006.01); G11B 3/70 (2006.01)
CPC G11B 11/16 (2013.01) [G11B 3/70 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A process for the production of a phonograph film or disc for analog storage, recording and/or reproduction of a sound content, comprising at least the following steps:
cold pouring, on the surface of a molding disc bearing at least one relief configured to negatively encode said sound content distributed in a spiral-like direction, starting from the perimeter edge towards the center of said surface, of an aqueous composition comprising a gelling agent of natural origin, so as to form a homogeneous film or layer of said aqueous composition on said surface of the molding disc having a flat face and a printed opposite face, and allowing said film or layer to solidify;
said relief being configured to form, following said solidification, a corresponding groove encoding said sound content on the printed face of said film or layer in contact with said surface of the molding disc;
separating said film or layer from the molding disc in such a way as to obtain said phonograph film or disc.