Patent US2998296A successfully refreshed from Google Patents.
US2998296A
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Alkaline treatment of polyethylene terephthalate filaments or staple fibers to improve processing in textile machines and filaments produced thereby
Assignee: Onderzoekings Instituut Research
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Filing: 1957-11-27
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Granted: 1961-08-29
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Expires: 1977-11-27
Abstract
No abstract record available.
Inventors
- 👤 Hennemann Georg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:37
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/07; D06M11/30; D06M11/32; D06M11/36; D06M11/38; D06M11/51; D06M11/53; D06M11/68; D06M11/70; D06M11/71; D06M11/77; D06M11/79; D06M11/80; D06M11/82; D06M13/00; D06M13/322; D06M13/372
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS FOR TREATING POLYETHYLENE TEREPHTHALATE FILAMENTS, WHICH CONSISTS ESSENTIALLY OF THE STEPS OF IMPREGNATING SAID FILAMENTS WITH AN AQUEOUS SOLUTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALIMETAL HYDROXIDES AND ALKALI-METAL SALTS OF WEAK INORGANIC ACIDS, THE CONCENTRATION OF THE ALKALI-METAL HYDROXIDE IN THE AQUEOUS SOLUTION BEING ABOUT 0.2 TO 1.0% BY WEIGHT AND THE CONCENTRATION OF THE ALKALI-METAL SALT IN THE AQUEOUS SOLUTION BEING ABOUT 0.5 TO 10% BY WEIGHT, RE MOVING SAID AQUEOUS SOLUTION BEFORE SUBSTANTIAL HYDROLYSIS OF SAID FILAMENTS OCCURS BUT AFTER SUFFICIENT TREATMENT TO IMPART TO SAID FILAMENTS IMPROVED PROCESSABILITY WHEN SAID FILAMENTS ARE CUT INTO STAPLE FIBERS AND THE STAPLE FIBERS ARE PROCESSED ON CARDING, DRAWING AND COMBING MACHINES, CUTTING THE SO-TREATED FILAMENTS INTO STAPLE FIBERS, AND THEREAFTER HEAT-STABILIZING THE STAPLE FIBERS BY TREATING THE SAME FOR 30 MINUTES AT 140*C. WITH STEAM.
Claim 2
Dependent Claim
141 words
A PROCESS FOR TREATING POLYETHYLENE TEREPHTHALATE FILAMENTS, WHICH CONSISTS ESSENTIALLY OF THE STEPS OF IMPREGNATING SAID FILAMENTS WITH AN AQUEOUS SOLUTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALIMETAL HYDROXIDES AND ALKALI-METAL SALTS OF WEAK INORGANIC ACIDS, THE CONCENTRATION OF THE ALKALI-METAL HYDROXIDE IN THE AQUEOUS SOLUTION BEING ABOUT 0.2 TO 1.0% BY WEIGHT AND THE CONCENTRATION OF THE ALKALI-METAL SALT IN THE AQUEOUS SOLUTION BEING ABOUT 0.5 TO 10% BY WEIGHT, RE MOVING SAID AQUEOUS SOLUTION BEFORE SUBSTANTIAL HYDROLYSIS OF SAID FILAMENTS OCCURS BUT AFTER SUFFICIENT TREATMENT TO IMPART TO SAID FILAMENTS IMPROVED PROCESSABILITY WHEN SAID FILAMENTS ARE CUT INTO STAPLE FIBERS AND THE STAPLE FIBERS ARE PROCESSED ON CARDING, DRAWING AND COMBING MACHINES, CUTTING THE SO-TREATED FILAMENTS INTO STAPLE FIBERS, AND THEREAFTER HEAT-STABILIZING THE STAPLE FIBERS BY TREATING THE SAME FOR 30 MINUTES AT 140*C. WITH STEAM.
References Cited (Backward Citations)
US2757064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |