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Patent US3629203A successfully refreshed from Google Patents.
US3629203A
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Process for the manufacture of poly-beta-alanine comprising reacting acrylonitrile with formic acid
Assignee: Lonza AG
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Filing: 1970-02-18
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Granted: 1971-12-21
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Expires: 1990-02-18
Abstract
Abstract POLY-B-ALANINE IS PRODUCED BY REACTING ACRYLONITRILE WITH FORMIC ACID AT A TEMPERATURE OF 150*-300*C. (PREFERABLY 200*-240*C.) UNDER PRESSURE.
Inventors
- 👤 Theodor Volker
- 👤 Hanspeter Hugener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:39
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C07; C07K; C07K1/00; C07K1/006; Y; Y10; Y10S; Y10S930/00; Y10S930/01; Y10S930/29
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |