Patent US3316221A successfully refreshed from Google Patents.
US3316221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic ester cocatalysts for lactam polymerization
Assignee: EIDP Inc
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Filing: 1963-07-01
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Granted: 1967-04-25
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Expires: 1983-07-01
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:05
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
IN THE PROCESS FOR THE ANHYDROUS POLYMERIZATION OF A LACTAM TO POLYAMIDES IN THE PRESENCE OF LACTAM-BASE SALTS AT A TEMPERATURE BETWEEN THE MELTING POINT OF SAID LACTAM AND THE MELTING POINT OF SAID POLYAMIDE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID POLYMERIZATION IN THE PRESENCE OF FROM ABOUT 0.1 TO 5 WEIGHT PERCENT OF AN AROMATIC ESTER COCATALYST FREE OIF NON-BENZENOID UNSATURATION AND HAVING AN EXOCYCLIC CARBOXYLATE GROUP BONDED THROUGH THE ETHER OXYGEN THEREIN DIRECTLY TO CARBOCYCLIC AROMATIC CARBON, THE CARBONYL CARBON IN SAID CARBOXYLATE GROUP BONDED TO ANY RADICAL IN THE REMAINDER OF THE ESTER BEING BONDED TO ONE OF THE GROUP CONSISTING OF CARBON AND TERTIARY NITROGEN THE OTHER TWO SUBSTITUENTS ON SAID TERITARY NITROGEN BEING ALIPHATICALLY SATURATED, ANY ACYCLIC CHAIN SEPARATING SAID CARBOXYLATE GROUP FROM ANOTHER SUCH CARBOXYLATE GROUP BEARING AT LEAST FOUR CARBON ATOMS IN SAID CHAIN.
Claim 2
Dependent Claim
142 words
IN THE PROCESS FOR THE ANHYDROUS POLYMERIZATION OF A LACTAM TO POLYAMIDES IN THE PRESENCE OF LACTAM-BASE SALTS AT A TEMPERATURE BETWEEN THE MELTING POINT OF SAID LACTAM AND THE MELTING POINT OF SAID POLYAMIDE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID POLYMERIZATION IN THE PRESENCE OF FROM ABOUT 0.1 TO 5 WEIGHT PERCENT OF AN AROMATIC ESTER COCATALYST FREE OIF NON-BENZENOID UNSATURATION AND HAVING AN EXOCYCLIC CARBOXYLATE GROUP BONDED THROUGH THE ETHER OXYGEN THEREIN DIRECTLY TO CARBOCYCLIC AROMATIC CARBON, THE CARBONYL CARBON IN SAID CARBOXYLATE GROUP BONDED TO ANY RADICAL IN THE REMAINDER OF THE ESTER BEING BONDED TO ONE OF THE GROUP CONSISTING OF CARBON AND TERTIARY NITROGEN THE OTHER TWO SUBSTITUENTS ON SAID TERITARY NITROGEN BEING ALIPHATICALLY SATURATED, ANY ACYCLIC CHAIN SEPARATING SAID CARBOXYLATE GROUP FROM ANOTHER SUCH CARBOXYLATE GROUP BEARING AT LEAST FOUR CARBON ATOMS IN SAID CHAIN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |