Patent US3342783A successfully refreshed from Google Patents.
US3342783A
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US
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Process for the manufacture of polyamides from alpha, alpha-dialkyl substituted beta-lactams
Assignee: Hoechst AG
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Filing: 1963-04-01
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Granted: 1967-09-19
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Expires: 1983-04-01
Abstract
No abstract record available.
Inventors
- 👤 Schlack Paul
- 👤 Jensen Harald
- 👤 Lohaus Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:04
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A PROCESS FOR THE MANUFACTURE OF A LINEAR POLYAMIDE HAVING AMIDE GROUPS IN B-POSITION, WHICH PROCESS COMPRISES POLYMERIZING, AT A TEMPERATURE IN THE RANGE FROM 180*C. TO 300*C., A B-LACTAM FREE OF SUBSTITUENTS OTHER THAN HYDROGEN AT THE NITROGEN ATOM AND HAVING TWO ALKYL GROUPS IN THE A-POSITION TO THE CARBONYL GROUP AND AT MOST ONE ALKYL GROUP IN THE B-POSITION, SAID ALKYL GROUPS IN THE A-POSITION HAVING TOGETHER AT MOST 5 CARBON ATOMS, AND SAID ALKYL GROUP IN THE B-POSITION HAVING AT MOST 3 CARBON ATOMS.
Claim 2
Dependent Claim
87 words
A PROCESS FOR THE MANUFACTURE OF A LINEAR POLYAMIDE HAVING AMIDE GROUPS IN B-POSITION, WHICH PROCESS COMPRISES POLYMERIZING, AT A TEMPERATURE IN THE RANGE FROM 180*C. TO 300*C., A B-LACTAM FREE OF SUBSTITUENTS OTHER THAN HYDROGEN AT THE NITROGEN ATOM AND HAVING TWO ALKYL GROUPS IN THE A-POSITION TO THE CARBONYL GROUP AND AT MOST ONE ALKYL GROUP IN THE B-POSITION, SAID ALKYL GROUPS IN THE A-POSITION HAVING TOGETHER AT MOST 5 CARBON ATOMS, AND SAID ALKYL GROUP IN THE B-POSITION HAVING AT MOST 3 CARBON ATOMS.
References Cited (Backward Citations)
US3093618A
Cited
US3211706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |