US3227792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution spinning of polyhexamethylene terephthalamide
Assignee: Celanese Corp
•
Filing: 1960-06-07
•
Granted: 1966-01-04
•
Expires: 1980-06-07
Abstract
No abstract record available.
Inventors
- 👤 Arnold J Rosenthal
- 👤 Cipriani Cipriano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:54
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/095; C08J2377/00; C08J2377/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A PROCESS COMPRISING FORMING A SOLUTION OF POLYHEXAMETHYLENE TEREPHTHALAMIDE IN WHICH THE HEXAMETHYLENE GROUPS ARE STRAIGHT CHAIN, IN A SOLVENT CONSISTING ESSENTIALLY OF FORMIC ACID AND A MINOR AMOUNT OF HYDROGEN CHLORIDE INTO FILAMENTS, SAID POLYHEXAMETHYLENE TEREPHTHALAMIDE HAVING AN INHERENT VISCOSITY OF AT LEAST ABOUT ABOUT ONE DETERMINED FROM A SOLUTION OF 0.1% OF POLYMER IN CONCENTRATED SULFURIC ACID AT 25*C.
Claim 2
Dependent Claim
61 words
A PROCESS COMPRISING FORMING A SOLUTION OF POLYHEXAMETHYLENE TEREPHTHALAMIDE IN WHICH THE HEXAMETHYLENE GROUPS ARE STRAIGHT CHAIN, IN A SOLVENT CONSISTING ESSENTIALLY OF FORMIC ACID AND A MINOR AMOUNT OF HYDROGEN CHLORIDE INTO FILAMENTS, SAID POLYHEXAMETHYLENE TEREPHTHALAMIDE HAVING AN INHERENT VISCOSITY OF AT LEAST ABOUT ABOUT ONE DETERMINED FROM A SOLUTION OF 0.1% OF POLYMER IN CONCENTRATED SULFURIC ACID AT 25*C.
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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 |