Patent US2897044A successfully refreshed from Google Patents.
US2897044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of artificial protein threads, fibres, filaments and the like
Assignee: Akzo Nobel UK PLC
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Filing: 1957-07-29
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Granted: 1959-07-28
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Expires: 1977-07-29
Abstract
No abstract record available.
Inventors
- 👤 Robert L Wormell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:22
CPC Classifications
D; D01; D01F; D01F4/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A PROCESS FOR TTHE PRODUCTION OF REGENERATED PROTEIN THREADS WHICH COMPRISES EXTRUDING AN AQUEOUS ALKALINE SOLUTION OF A PROTEIN CHOSEN FROM THE GROUP CONSISTING OF LACTIC CASEIN, PEANUT PROTEIN, SOYA BEAN PROTEIN AND CASTOR BEAN PROTEIN THROUGH A JET INTO A SULPHURIC ACID COAGULATING BATH IN WHICH IS DISSOLVED A TRIVALENT CHROMIUM SALT, STRETCHING THE RESULTANT THREAD AT LEAST 100 PERCENT IN A STRETCHING BATH AT A TEMPERATURE OF AT LEAST 50* C., SAID BATH CONTAINING A TRIVALENT CHROMIUM SALT AND AT LEAST ONE SALT CHOSEN FROM THE GROUP CONSISTING OF SODIUM SULPHATE AND ALUMINUM SULPHATE AND HARDENING THE STRETCHED THREAD IN A HARDENING BATH ALSO CONTAINING A TRIVALENT CHROMIUM SALT AND AT LEAST ONE SALT CHOSEN FROM THE GROUP CONSISTING OF SODIUM SULPHATE AND ALUMINIUM SULPHATE, THE COAGULATING, STRETCHING AND HARDENING BATHS EACH CONTAINING THE EQUIVALENT OF AT LEAST 10 GRAMS PER LITER OF CR2O3.
Claim 2
Dependent Claim
146 words
A PROCESS FOR TTHE PRODUCTION OF REGENERATED PROTEIN THREADS WHICH COMPRISES EXTRUDING AN AQUEOUS ALKALINE SOLUTION OF A PROTEIN CHOSEN FROM THE GROUP CONSISTING OF LACTIC CASEIN, PEANUT PROTEIN, SOYA BEAN PROTEIN AND CASTOR BEAN PROTEIN THROUGH A JET INTO A SULPHURIC ACID COAGULATING BATH IN WHICH IS DISSOLVED A TRIVALENT CHROMIUM SALT, STRETCHING THE RESULTANT THREAD AT LEAST 100 PERCENT IN A STRETCHING BATH AT A TEMPERATURE OF AT LEAST 50* C., SAID BATH CONTAINING A TRIVALENT CHROMIUM SALT AND AT LEAST ONE SALT CHOSEN FROM THE GROUP CONSISTING OF SODIUM SULPHATE AND ALUMINUM SULPHATE AND HARDENING THE STRETCHED THREAD IN A HARDENING BATH ALSO CONTAINING A TRIVALENT CHROMIUM SALT AND AT LEAST ONE SALT CHOSEN FROM THE GROUP CONSISTING OF SODIUM SULPHATE AND ALUMINIUM SULPHATE, THE COAGULATING, STRETCHING AND HARDENING BATHS EACH CONTAINING THE EQUIVALENT OF AT LEAST 10 GRAMS PER LITER OF CR2O3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |