Patent US2749331A successfully refreshed from Google Patents.
US2749331A
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Synthetic linear polyamides obtained by the base-catalyzed polymerization of unsaturated amides
Assignee: Hercules Powder Co
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Filing: 1952-07-05
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Granted: 1956-06-05
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Expires: 1972-07-05
Abstract
No abstract record available.
Inventors
- 👤 David S Breslow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:29
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
THE PROCESS OF PREPARING A SYNTHETIC LINEAR POLYAMIDE WHICH COMPRISES CONTACTING UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AN AMIDE, CONTAINING AS ITS ONLY OLEFINS UNSATURATION AN ETHYLENE DOUBLE BOND IN THE ALPHA POSITION TO THE AMIDE CARBONYL RADICAL AND ALSO CONTAINING ACTIVE HYDROGEN, AT LEAST ONE OF WHICH IS ATTACHED TO THE AMIDO NITROGEN, WITH A STRONGLY BASIC CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS, ALKALI METAL HYDROXIDES, QUATERNARY AMMONIUM HYDROXIDES, ALKALI METAL ALKOXIDES, ALKALI METAL AMIDE, ALKALI METAL HYDRIDES, AND ALKALI METAL ARAKYLS, SAID BASIC CATALYST BEING THE SOLE POLYMERIZATION CATALYST PRESENT AND SAID AMIDE BEING THE SOLE POLYMERIZABLE MATERIAL PRESENT.
Claim 2
Dependent Claim
102 words
THE PROCESS OF PREPARING A SYNTHETIC LINEAR POLYAMIDE WHICH COMPRISES CONTACTING UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AN AMIDE, CONTAINING AS ITS ONLY OLEFINS UNSATURATION AN ETHYLENE DOUBLE BOND IN THE ALPHA POSITION TO THE AMIDE CARBONYL RADICAL AND ALSO CONTAINING ACTIVE HYDROGEN, AT LEAST ONE OF WHICH IS ATTACHED TO THE AMIDO NITROGEN, WITH A STRONGLY BASIC CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS, ALKALI METAL HYDROXIDES, QUATERNARY AMMONIUM HYDROXIDES, ALKALI METAL ALKOXIDES, ALKALI METAL AMIDE, ALKALI METAL HYDRIDES, AND ALKALI METAL ARAKYLS, SAID BASIC CATALYST BEING THE SOLE POLYMERIZATION CATALYST PRESENT AND SAID AMIDE BEING THE SOLE POLYMERIZABLE MATERIAL PRESENT.
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) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |