US3015652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyamides
Assignee: Bayer AG
•
Filing: 1957-08-06
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Granted: 1962-01-02
•
Expires: 1977-08-06
Abstract
No abstract record available.
Inventors
- 👤 Schnell Hermann
- 👤 Fritz Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:25
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20; Y; Y10; Y10S; Y10S264/00; Y10S264/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
THE PROCESS FOR PRODUCING A POLYAMIDE BY IONIC POLYMERIZATION OF A LACTAN SELECTED FROM THE GROUP CONSISTING OF E-CAPROLACTAM, C-METHYL-E-CAPROLACTAN, THE LACTAN OF W-AMINOENANTHIC ACID AND THE W-CAPRYL LACTAN, WHICH COMPRISES HEATING IN THE COMPLETE ABSENCE OF WATER A MIXTURE OF SAID LACTAM, A BASIC LACTAN POLYMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METALS, ALKALI AND ALKALINE EARTH METAL AND HYDRIDES, OXIDES, HYDROXIDES AND SALTS OF WEAK ACID COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF CARBONIC ACID, ACETIC ACID, BENZOIC ACID AND 4,4''-DIHYDROXYDIPHENYL2,2''-PROPANE, AND AN ADDED ACCELERATOR SELECTED FROM THE GROUP CONSISTING OF:
Claim 2
Dependent Claim
98 words
THE PROCESS FOR PRODUCING A POLYAMIDE BY IONIC POLYMERIZATION OF A LACTAN SELECTED FROM THE GROUP CONSISTING OF E-CAPROLACTAM, C-METHYL-E-CAPROLACTAN, THE LACTAN OF W-AMINOENANTHIC ACID AND THE W-CAPRYL LACTAN, WHICH COMPRISES HEATING IN THE COMPLETE ABSENCE OF WATER A MIXTURE OF SAID LACTAM, A BASIC LACTAN POLYMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF ALKALI AND ALKALINE EARTH METALS, ALKALI AND ALKALINE EARTH METAL AND HYDRIDES, OXIDES, HYDROXIDES AND SALTS OF WEAK ACID COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF CARBONIC ACID, ACETIC ACID, BENZOIC ACID AND 4,4''-DIHYDROXYDIPHENYL2,2''-PROPANE, AND AN ADDED ACCELERATOR SELECTED FROM THE GROUP CONSISTING OF:
References Cited (Backward Citations)
US2241321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-01 | 1965-07-03 | 1966-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-01 | 1969-07-03 | 1970-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-01 | 1973-07-03 | 1974-01-02 | $7700.00 | Window Closed / Lapsed |