US3711323A
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US
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Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1970-08-17
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Granted: 1973-01-16
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Expires: 1990-08-17
Abstract
Abstract THE PRESENT INVENTION RELATES TO A COPOLYMER OF (A) ACRYLIC ACID AND (B) AN ACRYLATE SELECTED FROM THE CLASS CONSISTING OF SODIUM, POTASSIUM AND AMMONIUM ACRYLATES, THE MOLAR OF RATIO OF (A) AND (B) BEING FROM 1:0.3 TO 1:6 AND A 5% WEIGHT AQUEOUS SOLUTION OF THE COPOLYMER AT 20* C. HAVING A PH OF 4.0 TO 6.5 AND A VISCOSITY AS MEASURED BY A BROOKFIELD VISCOMETER BETWEEN 20 CPS. WHEN MEASURED USING A NO. 1 SPINDLE AND 4000 CPS. WHEN MEASURED USING A NO. 6 SPINDLE, THE SPINDLE SPEED IN BOTH CASES BEING 100 R.P.M. IT ALSO RELATES TO AQUEOUS SOLUTIONS OF SUCH COPOLYMERS AND THEIR USE AS SIZES FOR STAPLE YARNS.
Inventors
- 👤 V Heap
- 👤 E Rothwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:00
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/263; C; C08; C08F; C08F20/00; C08F20/62; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2907; Y10T428/2913; Y10T428/2933; Y10T428/2938
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |