Patent US2379689A successfully refreshed from Google Patents.
Patent US2873164A successfully refreshed from Google Patents.
US2873164A
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Process of bleaching polyacrylonitrile textiles with strong mineral acid pretreatment and then acidified sodium chlorite
Assignee: Solutia Inc
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Filing: 1955-02-28
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Granted: 1959-02-10
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Expires: 1975-02-28
Abstract
No abstract record available.
Inventors
- 👤 Walter H Hindle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:03
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/51; D06M11/55; D06L; D06L4/00; D06L4/20; D06L4/22; D06L4/24; D06L4/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS FOR BLEACHING TEXTILE MATERIALS FORMED FROM POLYMERIC COMPOSITIONS COMPRISING IN POLYMERIZED FORM AT LEAST 80 PERCENT BY WEIGHT ACRYLONITRILE UP TO 18 PERCENT OF OTHER MONO-OLEFINIC MONOMERS COPOLYMER IZABLE THEREWITH, AND FROM TWO TO TEN PERCENT OF AN N-HETEROCYCLIC MONOMER CONTAINING A POLYMERIZABLE ALKAENYL GROUP WHICH COMPRISES, IMMERSING SAID MATERIALS IN AN AQUEOUS SOLUTION OF A STRONG MINERAL ACID OF FROM 0.05 TO 0.5 PERCENT BY WEIGHT CONCENTRATION FOR FROM 15 TO 40 MINUTES AT A TEMPERATURE IN THE RANGE OF 185* TO 212* F. AND THERAFTER IMMERSING THE SAID MATERIALS IN AN AQUEOUS SOLUTION CONTAINING FROM 2.5 TO 6.0 PERCENT SODIUM CHORITE, BASED ON THE WEIGHT OF THE MATERIALS TREATED, AT A TEMPERATURE IN THE RANGE OF 140* TO 180* F. UNTIL NO FURTHER BLEACHING OCCURS
Claim 2
Dependent Claim
129 words
A PROCESS FOR BLEACHING TEXTILE MATERIALS FORMED FROM POLYMERIC COMPOSITIONS COMPRISING IN POLYMERIZED FORM AT LEAST 80 PERCENT BY WEIGHT ACRYLONITRILE UP TO 18 PERCENT OF OTHER MONO-OLEFINIC MONOMERS COPOLYMER IZABLE THEREWITH, AND FROM TWO TO TEN PERCENT OF AN N-HETEROCYCLIC MONOMER CONTAINING A POLYMERIZABLE ALKAENYL GROUP WHICH COMPRISES, IMMERSING SAID MATERIALS IN AN AQUEOUS SOLUTION OF A STRONG MINERAL ACID OF FROM 0.05 TO 0.5 PERCENT BY WEIGHT CONCENTRATION FOR FROM 15 TO 40 MINUTES AT A TEMPERATURE IN THE RANGE OF 185* TO 212* F. AND THERAFTER IMMERSING THE SAID MATERIALS IN AN AQUEOUS SOLUTION CONTAINING FROM 2.5 TO 6.0 PERCENT SODIUM CHORITE, BASED ON THE WEIGHT OF THE MATERIALS TREATED, AT A TEMPERATURE IN THE RANGE OF 140* TO 180* F. UNTIL NO FURTHER BLEACHING OCCURS
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-09 | 1962-08-11 | 1963-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-09 | 1966-08-11 | 1967-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-09 | 1970-08-11 | 1971-02-10 | $7700.00 | Window Closed / Lapsed |