US3121766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wet spinning of birefringent solutions of optically active polypeptide
Assignee: Akzo Nobel UK PLC
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Filing: 1962-05-08
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Granted: 1964-02-18
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Expires: 1982-05-08
Abstract
No abstract record available.
Inventors
- 👤 Denis George Harold Ballard
- 👤 James Dennis Griffiths
- 👤 James Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:28
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR THE PRODUCTION OF POLYPEPTIDE FIBRES CONSISTING OF AT LEAST 90 PERCENT BY WEIGHT OF UNITS OF AN OPTICALLY ACTIVE FORM OF GAMMA-METHYL GLUTAMATE COMPRISING EXTRUDING A BIREFRINGENT SOLUTION OF THE POLYMER INTO A LIQUID COAGULATING BATH AT A SPINNING SPEED OF AT LEAST 140 METERS PER MINUTE AND STRETCHING THE RESULTANT FIBRE WHILE THE POLYMER IS STILL IN THE ALPHA CONFIGURATION THEREBY CONVERTING THE POLYMER SUBSTANTIALLY INTO THE BETA CONFIGURATION AND SUBSTANTIALLY ORIENTING THE FIBRE ALONG ITS AXIS.
Claim 2
Dependent Claim
81 words
A PROCESS FOR THE PRODUCTION OF POLYPEPTIDE FIBRES CONSISTING OF AT LEAST 90 PERCENT BY WEIGHT OF UNITS OF AN OPTICALLY ACTIVE FORM OF GAMMA-METHYL GLUTAMATE COMPRISING EXTRUDING A BIREFRINGENT SOLUTION OF THE POLYMER INTO A LIQUID COAGULATING BATH AT A SPINNING SPEED OF AT LEAST 140 METERS PER MINUTE AND STRETCHING THE RESULTANT FIBRE WHILE THE POLYMER IS STILL IN THE ALPHA CONFIGURATION THEREBY CONVERTING THE POLYMER SUBSTANTIALLY INTO THE BETA CONFIGURATION AND SUBSTANTIALLY ORIENTING THE FIBRE ALONG ITS AXIS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-17 | 1967-08-19 | 1968-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-17 | 1971-08-19 | 1972-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-17 | 1975-08-19 | 1976-02-18 | $7700.00 | Window Closed / Lapsed |