US3154512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terephthalamide polyemer in solvent comprising antimony trichloride and acetic or formic acid
Assignee: Celanese Corp
•
Filing: 1960-07-13
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Granted: 1964-10-27
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Expires: 1980-07-13
Abstract
No abstract record available.
Inventors
- 👤 Krzysztof I Parczewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:23
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/095; C08J2377/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
A SOLUTION OF A HIGH MOLECULAR WEIGHT POLYTEREPHTHALAMIDE CONTAINING REPEATING STRUCTURAL UNITS OF THE FORMULA -NR-Y-NR''-CO-P-C6H4-CO-, WHERE R AND R'' ARE EACH SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND A MONOVALENT ORGANIC RADICAL, AND Y IS A DIVALENT ORGANIC RADICAL, IN A SOLVENT COMPRISING AT LEAST 70% BY WEIGHT OF ANTIMONY TRICHLORIDE AND A DILUENT SELECTED FROM THE GROUP CONSISTING OF FORMIC ACID AND ACETIC ACID IN AN AMOUNT UP TO 30% BY WEIGHT OF THE SOLVENT.
References Cited (Backward Citations)
US2949440A
Cited
US3081273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |