Manufacturing Artificial Silk Threads, US Patent No. 1494841
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US patent 1,494,841, granted May 20, 1924 to Martin Hölken Jr. of Barmen, Germany, for an improved stretch-spinning process for making artificial silk (rayon) threads from copper oxide-ammonia cellulose solutions. The invention lengthens the air path between the precipitating bath and the hardening liquid, so most stretching happens in open air, and applies the hardening liquid to thread wound on a large reel. The specification explains the prior method, describes the apparatus shown in the drawing, and ends with three claims.
- Type
- Patent
- Date
- January 25, 1923
- Language
- English
- Pages
- 5
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From Ralph Griswold's Digital Archive, delivered by the University of Arizona.
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