US3135812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the continuous manufacture of high grade acrylic fibers
Assignee: Teijin Ltd
•
Filing: 1960-12-28
•
Granted: 1964-06-02
•
Expires: 1980-12-28
Abstract
No abstract record available.
Inventors
- 👤 Taniyama Masakazu
- 👤 Hatano Masahiko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:24
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44; D; D01; D01F; D01F6/00; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS FOR THE CONTINUOUS MANUFACTURE OF ACRYLIC FIBERS COMPRISING ADDING A 52 TO 58% CONCENTRATION OF AQUEOUS ZINC CHLORIDE SOLUTION TO A MONOMER MIXTURE CONSISTING OF ACRYLONITRILE AND A COMONOMER OF 8 TO 12% BY WEIGHT OF SAID MONOMER MIXTURE TO FORM A SOLUTION OF SAID MONOMER MIXTURE IN SAID AQUEOUS ZINC CHLORIDE SOLUTION, SOLUTION POLYMERIZING BY FORCING THE SOLUTION INTO A CLOSED REACTION VESSEL SO THAT SAID SOLUTION HAS A RANGE OF PRESSURE OF 1 TO 5 KG./CM.2 BY GAUGE WHEREBY THE RESULTING POLYMER SOLUTION CONTAINS NO FOAM AND GEL SUBSTANCE, SPINNING SAID POLYMER SOLUTION INTO A COAGULATING BATH OF 20% OR LOWER SALT CONCENTRATION AT A TEMPERATURE OF 10* TO 25*C., AND SUBJECTING THE RESULTING TOW TO STRETCHING OVER 8 TIMES ITS ORIGINAL LENGTH AND THEN RELAXATION OVER 20%.
Claim 2
Dependent Claim
132 words
A PROCESS FOR THE CONTINUOUS MANUFACTURE OF ACRYLIC FIBERS COMPRISING ADDING A 52 TO 58% CONCENTRATION OF AQUEOUS ZINC CHLORIDE SOLUTION TO A MONOMER MIXTURE CONSISTING OF ACRYLONITRILE AND A COMONOMER OF 8 TO 12% BY WEIGHT OF SAID MONOMER MIXTURE TO FORM A SOLUTION OF SAID MONOMER MIXTURE IN SAID AQUEOUS ZINC CHLORIDE SOLUTION, SOLUTION POLYMERIZING BY FORCING THE SOLUTION INTO A CLOSED REACTION VESSEL SO THAT SAID SOLUTION HAS A RANGE OF PRESSURE OF 1 TO 5 KG./CM.2 BY GAUGE WHEREBY THE RESULTING POLYMER SOLUTION CONTAINS NO FOAM AND GEL SUBSTANCE, SPINNING SAID POLYMER SOLUTION INTO A COAGULATING BATH OF 20% OR LOWER SALT CONCENTRATION AT A TEMPERATURE OF 10* TO 25*C., AND SUBJECTING THE RESULTING TOW TO STRETCHING OVER 8 TIMES ITS ORIGINAL LENGTH AND THEN RELAXATION OVER 20%.
References Cited (Backward Citations)
US2356767A
Cited
US2648647A
Cited
US2793199A
Cited
US2790700A
Cited
US2867602A
Cited
US2858290A
Cited
US2949444A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |