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Guido Dessauer, Kurt Ramlow, Kurt Riecke and Franz Wirnitzer received US Patent No. 4,131,710 on December 26, 1978, filed January 18, 1977. It was assigned to Feldmuehle AG.
The patent's abstract:
A recording sheet consisting mainly of fibrous material is capable of displaying a colored image when contacted under pressure with substantially colorless crystal violet lactone and similar dye precursors if at least 3% of the fibrous material is constituted by uniformly distributed asbestos fibers. Sheets having adequate strength for carbonless copying should not contain more than 30% asbestos fibers. Stronger colors are obtained if the sheet further contains a mixture of γ-alumina and γ-alumina precursors in an amount of 2% to 20% of the weight of the fibrous material, the mixture containing 1% to 30% water volatile at 1000° C, and being converted substantially entirely to γ-alumina when heated from 300° to 1000° C.
- Author
- Guido Dessauer; Kurt Ramlow; Kurt Riecke; Franz Wirnitzer
- Published by
- US Patent and Trademark Office
- Series
- US Patent No. 4,131,710
- Date
- December 26, 1978
- Library no.
- ACL Doc 23527 · asbestosclaims.law/library/23527
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 5 pages · 525 KB
Where it was listed
- Asbestos, April 1979, in its patents department (the year's issues)
Cited on this site
Cite this document
Guido Dessauer, Kurt Ramlow, Kurt Riecke, Franz Wirnitzer. “Recording material containing asbestos (US Patent 4,131,710, 1978).” December 26, 1978. US Patent No. 4,131,710. US Patent and Trademark Office. AsbestosClaims.Law Library, ACL Doc 23527. https://asbestosclaims.law/library/23527.
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