GB432003A - Duplicating phonograph record matrices - Google Patents
Duplicating phonograph record matricesInfo
- Publication number
- GB432003A GB432003A GB33/35A GB3335A GB432003A GB 432003 A GB432003 A GB 432003A GB 33/35 A GB33/35 A GB 33/35A GB 3335 A GB3335 A GB 3335A GB 432003 A GB432003 A GB 432003A
- Authority
- GB
- United Kingdom
- Prior art keywords
- matrix
- electrodeposition
- rinsed
- thin
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
- G11B3/68—Record carriers
- G11B3/70—Record carriers characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers
Landscapes
- Printing Plates And Materials Therefor (AREA)
Abstract
432,003. Duplicating phonograph - record matrices by electrodeposition. ELECTRICAL RESEARCH PRODUCTS, Inc., 195, Broadway, New York, U.S.A.-(Assignees of Pollard, C. E. ; 413, Warren Avenue, Hohokus, and Russell, A. G. ; 47, Rector Place, Red Bank, both in New Jersey, U.S.A.) Jan. 1, 1935, No. 33. Convention date, Aug. 16, 1934. [Class 41] A metal matrix 10 is coated by electrodeposition with a thin chromium layer 11. After the usual surface film has formed on the chromium, a thin layei of metal 12 is applied tc it by sputtering. A steel ring 13 covered with rubber 14 is then clamped round the matrix and copper is deposited by electrodeposition to about the thickness of the matrix 10. The ring 13 is then removed, enabling the copper deposit to be easily separated to form a negative of the matrix 10. Before chromiumplating, the matrix 10 may be cleaned electrolytically in hot caustic solution, rinsed and brushed, returned to the electrolytic cleaner, rinsed and dipped in dilute hydrochloric acid, rinsed and then treated in sodium cyanide solution.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US432003XA | 1934-08-16 | 1934-08-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB432003A true GB432003A (en) | 1935-07-18 |
Family
ID=21925995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33/35A Expired GB432003A (en) | 1934-08-16 | 1935-01-01 | Duplicating phonograph record matrices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB432003A (en) |
-
1935
- 1935-01-01 GB GB33/35A patent/GB432003A/en not_active Expired
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