US3227793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinning of a poly(polymethylene) terephthalamide
Assignee: Celanese Corp
•
Filing: 1961-01-23
•
Granted: 1966-01-04
•
Expires: 1981-01-23
Abstract
No abstract record available.
Inventors
- 👤 Cipriani Cipriano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:51
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A PROCESS OF EXTRUDING A SOLUTION N CONCENTRATED SULFURIC ACID OF AT LEAST 80% BY WEIGHT ACID CONCENTRATION, OF A POLY(POLYMETHYLENE) TEREPHTHALAMIDE, THE POLYMETHYLENE GROUPS OF WHICH CONTAIN 2 TO 10 CARBON ATOMS, INTO A SPIN BATH OF AQUEOUS SULFURIC ACID HAVING A CONCENTRATION AND TEMPERATURE WITHIN THE AREA ENCLOSED BY CURVES A AND B OF FIGURE 1, SUCH THAT THE POLYMER IS COAGULATED INTO A SHAPED ARTICLE.
Claim 2
Dependent Claim
68 words
A PROCESS OF EXTRUDING A SOLUTION N CONCENTRATED SULFURIC ACID OF AT LEAST 80% BY WEIGHT ACID CONCENTRATION, OF A POLY(POLYMETHYLENE) TEREPHTHALAMIDE, THE POLYMETHYLENE GROUPS OF WHICH CONTAIN 2 TO 10 CARBON ATOMS, INTO A SPIN BATH OF AQUEOUS SULFURIC ACID HAVING A CONCENTRATION AND TEMPERATURE WITHIN THE AREA ENCLOSED BY CURVES A AND B OF FIGURE 1, SUCH THAT THE POLYMER IS COAGULATED INTO A SHAPED ARTICLE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |