US3154609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of crimped filaments
Assignee: Celanese Corp
•
Filing: 1962-03-29
•
Granted: 1964-10-27
•
Expires: 1982-03-29
Abstract
No abstract record available.
Inventors
- 👤 Cipriani Cipriano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:40
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01D; D01D5/00; D01D5/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN A PROCESS COMPRISING EXTRUDING A SOLUTION IN CONCENTRATED SULFURIC ACID OF AT LEAST 75% BY WEIGHT ACID CONCENTRATION, OF A FIBER FORMING CONDENSATION POLYMER CONTAINING REPEATING AMIDE GROUPS AS AN INTEGRAL PART OF THE POLYMER CHAIN, THROUGH AT LEAST ONE OPENING INTO AQUEOUS SULFURIC ACID OF ACID CONCENTRATION LOW ENOUGH TO CAUSE COAGULATION OF THE POLYMER AND THUS FORM AT LEAST ONE FILAMENT OF THE POLYMER, THE IMPROVEMENT COMPRISING STRETCHING SAID FILAMENT BEFORE DRYING IN THE RANGE OF 10 TO 150% OF THE INITIAL LENGTH OF THE FILAMENT, AND DRYING SAID FILAMENT WHILE IT IS AT LEAST PARTIALLY RELAXED WHEREBY IT DEVELOPS A TRIDIMENSIONAL CRIMP.
Claim 2
Dependent Claim
106 words
IN A PROCESS COMPRISING EXTRUDING A SOLUTION IN CONCENTRATED SULFURIC ACID OF AT LEAST 75% BY WEIGHT ACID CONCENTRATION, OF A FIBER FORMING CONDENSATION POLYMER CONTAINING REPEATING AMIDE GROUPS AS AN INTEGRAL PART OF THE POLYMER CHAIN, THROUGH AT LEAST ONE OPENING INTO AQUEOUS SULFURIC ACID OF ACID CONCENTRATION LOW ENOUGH TO CAUSE COAGULATION OF THE POLYMER AND THUS FORM AT LEAST ONE FILAMENT OF THE POLYMER, THE IMPROVEMENT COMPRISING STRETCHING SAID FILAMENT BEFORE DRYING IN THE RANGE OF 10 TO 150% OF THE INITIAL LENGTH OF THE FILAMENT, AND DRYING SAID FILAMENT WHILE IT IS AT LEAST PARTIALLY RELAXED WHEREBY IT DEVELOPS A TRIDIMENSIONAL CRIMP.
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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) | 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 |