GB620604A - Improvements in or relating to gramophone records - Google Patents

Improvements in or relating to gramophone records

Info

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
Application number
GB2569246A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB2569246A priority Critical patent/GB620604A/en
Publication of GB620604A publication Critical patent/GB620604A/en
Expired legal-status Critical Current

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].
GB2569246A 1946-08-28 1946-08-28 Improvements in or relating to gramophone records Expired GB620604A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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