US3317519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simultaneous depolymerization of polycaproamide and polyester with recovery of caprolactam
Assignee: Honeywell International Inc
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Filing: 1965-05-21
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Granted: 1967-05-02
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Expires: 1985-05-21
Abstract
No abstract record available.
Inventors
- 👤 Stanley D Lazarus
- 👤 Ian C Twilley
- 👤 Orvill E Snider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:34
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/02; C07D201/12; C07C; C07C51/00; C07C51/09; Y; Y10; Y10S; Y10S525/00; Y10S525/938
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS WHICH COMPRISES HEATING AN AQUEOUS COMPOSITION COMPRISING WATER AND A POLYMER MIXTURE OF POLY-E-CAPRAMIDE AND A POLYESTER FORMED FROM ALKYLENE GLYCOL AND AROMATIC HOMOCYCLIC DICARBOXYLIC ACID, THE COMPOSITION CONTAINING WATER:POLYMER MIXTURE IN INITIAL WEIGHT RATIO OF AT LEAST ABOUT 1:1 AND CONTAINING FROM ABOUT 3% TO ABOUT I0% BY WEIGHT OF ALKALI METAL HYDROXIDE BASED ON THE DRY WEIGHT OF SAID POLYMER MIXTURE, IN THE INITIAL REACTION MIXTURE; THE HEATING BEING AT A TEMPERATURE OF FROM ABOUT 180*C. TO ABOUT 320*C. AND A PRESSURE OF FROM ABOUT 150 TO ABOUT 350 POUNDS PER SQUARE INCH, THEREBY REGENERATNG ALKYLENE GLYCOL AND DICARBOXYLIC ACID TOGETHER WITH CAPROLACTAM.
Claim 2
Dependent Claim
107 words
A PROCESS WHICH COMPRISES HEATING AN AQUEOUS COMPOSITION COMPRISING WATER AND A POLYMER MIXTURE OF POLY-E-CAPRAMIDE AND A POLYESTER FORMED FROM ALKYLENE GLYCOL AND AROMATIC HOMOCYCLIC DICARBOXYLIC ACID, THE COMPOSITION CONTAINING WATER:POLYMER MIXTURE IN INITIAL WEIGHT RATIO OF AT LEAST ABOUT 1:1 AND CONTAINING FROM ABOUT 3% TO ABOUT I0% BY WEIGHT OF ALKALI METAL HYDROXIDE BASED ON THE DRY WEIGHT OF SAID POLYMER MIXTURE, IN THE INITIAL REACTION MIXTURE; THE HEATING BEING AT A TEMPERATURE OF FROM ABOUT 180*C. TO ABOUT 320*C. AND A PRESSURE OF FROM ABOUT 150 TO ABOUT 350 POUNDS PER SQUARE INCH, THEREBY REGENERATNG ALKYLENE GLYCOL AND DICARBOXYLIC ACID TOGETHER WITH CAPROLACTAM.
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) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |