US2719835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrogen-containing linear polyesters
Assignee: Solutia Inc
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Filing: 1954-07-30
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Granted: 1955-10-04
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Expires: 1974-07-30
Abstract
No abstract record available.
Inventors
- 👤 Robert L Sublett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:56
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
IN THE MANUFACTURE OF SYNTHETIC LINEAR CONDENSATION POLYESTERS, THE STEPS COMPRISING, HEATING AND REACTING A MIXTURE COMPRISING THE SALT FORMED BY THE REACTION OF TEREPHTHALIC ACID AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF N-METHYL-2-PYRROLIDONE, 1,5-DIMETHYLPYRROLIDONE, N-METHYLPIPERIDONE AND NMETHYLCAPROLACTAM, AND ETHYLENE GLYCOL, SAID SALT AND GLYCOL BEING PRESENT IN THE MIXTURE IN A MOLAR RATIO IN THE RANGE OF 1:1 TO 1:12, AND CONTINUING THE HEATING TO FORM THE POLYESTER.
Claim 2
Dependent Claim
71 words
IN THE MANUFACTURE OF SYNTHETIC LINEAR CONDENSATION POLYESTERS, THE STEPS COMPRISING, HEATING AND REACTING A MIXTURE COMPRISING THE SALT FORMED BY THE REACTION OF TEREPHTHALIC ACID AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF N-METHYL-2-PYRROLIDONE, 1,5-DIMETHYLPYRROLIDONE, N-METHYLPIPERIDONE AND NMETHYLCAPROLACTAM, AND ETHYLENE GLYCOL, SAID SALT AND GLYCOL BEING PRESENT IN THE MIXTURE IN A MOLAR RATIO IN THE RANGE OF 1:1 TO 1:12, AND CONTINUING THE HEATING TO FORM THE POLYESTER.
References Cited (Backward Citations)
DE914066C
Cited
US2664440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |