GB620604A - Improvements in or relating to gramophone records - Google Patents
Improvements in or relating to gramophone recordsInfo
- Publication number
- GB620604A GB620604A GB2569246A GB2569246A GB620604A GB 620604 A GB620604 A GB 620604A GB 2569246 A GB2569246 A GB 2569246A GB 2569246 A GB2569246 A GB 2569246A GB 620604 A GB620604 A GB 620604A
- Authority
- GB
- United Kingdom
- Prior art keywords
- black
- per cent
- filler
- amorphous carbon
- thermoplastic material
- 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
Abstract
The surface composition of a gramophone record comprises by weight 10 to 30 per cent amorphous carbon, 20 to 60 per cent thermoplastic material and 10 to 70 per cent filler of non-fibrous natural mineral material such as slate, rottenstone, barytes or dewaxed garnet. The particle size of the filler is preferably less than 10 microns. The thermoplastic material may contain shellac or natural or artificial resins. Carnaubo wax, Congo gum, polyvinyl acetal resin and pinewood resin are mentioned. The amorphous carbon may be carbon black, lamp black, vegetable black or acetylene black. The material is preferably used in the laminated record described in Specification 620,306, [Group XXXVIII].
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2569246A GB620604A (en) | 1946-08-28 | 1946-08-28 | Improvements in or relating to gramophone records |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2569246A GB620604A (en) | 1946-08-28 | 1946-08-28 | Improvements in or relating to gramophone records |
Publications (1)
Publication Number | Publication Date |
---|---|
GB620604A true GB620604A (en) | 1949-03-28 |
Family
ID=10231743
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2569246A Expired GB620604A (en) | 1946-08-28 | 1946-08-28 | Improvements in or relating to gramophone records |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB620604A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2997451A (en) * | 1957-03-07 | 1961-08-22 | Harry B Miller | Conductive phonograph record containing thermoplastic resin and carbon black |
-
1946
- 1946-08-28 GB GB2569246A patent/GB620604A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2997451A (en) * | 1957-03-07 | 1961-08-22 | Harry B Miller | Conductive phonograph record containing thermoplastic resin and carbon black |
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