Patent US3564599A successfully refreshed from Google Patents.
US3564599A
Expired / Lapsed
US
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Process for the preparation of poly-dodecalactam with high molecular weight
Assignee: Inventa AG fuer Forschung und Patentverwertung
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Filing: 1964-01-23
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Granted: 1971-02-16
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Expires: 1984-01-23
Abstract
Abstract 1. A PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT POLYAMIDE CAPABLE OF AFTER-POLYMERIZATION IN AN INERT GAS ATMOSPHERE AT TEMPERTURES BELOW ITS MELTING POINT, WHICH COMPRISES POLYMERIZING W-DODECALACTAM BY HEATING UNDER EXCLUSION OF WATER AT TEMPERATURE ABOVE 300*C. IN THE PRESENCE OF A PHOSPHONIC ACID IN THE AMOUNT OF 0.05-1% BY WEIGHT CALCULATED ON THE W-DODECALACTAM.
Inventors
- 👤 Siegfried Schaaf
- 👤 Wolfgang Griehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:46
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT POLYAMIDE CAPABLE OF AFTER-POLYMERIZATION IN AN INERT GAS ATMOSPHERE AT TEMPERTURES BELOW ITS MELTING POINT, WHICH COMPRISES POLYMERIZING W-DODECALACTAM BY HEATING UNDER EXCLUSION OF WATER AT TEMPERATURE ABOVE 300*C. IN THE PRESENCE OF A PHOSPHONIC ACID IN THE AMOUNT OF 0.05-1% BY WEIGHT CALCULATED ON THE W-DODECALACTAM.
Claim 2
Dependent Claim
55 words
A PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT POLYAMIDE CAPABLE OF AFTER-POLYMERIZATION IN AN INERT GAS ATMOSPHERE AT TEMPERTURES BELOW ITS MELTING POINT, WHICH COMPRISES POLYMERIZING W-DODECALACTAM BY HEATING UNDER EXCLUSION OF WATER AT TEMPERATURE ABOVE 300*C. IN THE PRESENCE OF A PHOSPHONIC ACID IN THE AMOUNT OF 0.05-1% BY WEIGHT CALCULATED ON THE W-DODECALACTAM.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |