Patent US2441968A successfully refreshed from Google Patents.
Patent US4534876A successfully refreshed from Google Patents.
US4534876A
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US
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Method for washing of textiles in hard water and phosphate-free detergent compositions for use therein
Assignee: DE BLAUWE LIER BV
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Filing: 1983-05-10
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Granted: 1985-08-13
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Expires: 2003-05-10
Abstract
Abstract A method is provided for washing of textiles in hard water under substantial exclusion of phosphates by combined use of an inorganic salt derived from carbondioxide, an acidic compound devoid of forming a precipitate with the calcium and magnesium ions in the washing liquor at usual dosage, and a surface active agent devoid of forming a precipitate under these conditions, maintaining the pH within the range of 5 to 8, and the temperature at at most 70° C. Also provided is a detergent composition comprising the above mentioned components in such a ratio that the pH of a 0.5% by weight solution in a washing liquor is within the range of 5 to 8.
Inventors
- 👤 Gwendolen Browne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:22
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/39; C11D3/3942; C11D3/02; C11D3/04; C11D3/042; C11D3/046; C11D3/10; C11D3/16; C11D3/20; C11D3/2075; C11D3/26; C11D3/33
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
A method for washing textiles in hard water at a temperature of at most 70° C. with substantially complete exclusion of phosphates, wherein to the washing liquor are added substantially simultaneously: (a) at least one inorganic salt derived from carbon dioxide inclusive hydrates, perhydrates and percarbonates thereof (b) at least one acidic compound devoid of formation of a precipitate with the calcium and magnesium ions in the washing liquor at usual dosage (c) at least one surface active compound devoid of formation of a precipitate with the calcium and magnesium ions in the washing liquor at usual dosage, the ratio of these components being such that the pH of the resulting washing liquor is maintained throughout the complete washing cycle within the range of 5 to 8, and the components (a) and (b) being added physically separated.
Claim 2
Independent Claim
137 words
A method for washing textiles in hard water at a temperature of at most 70° C. with substantially complete exclusion of phosphates, wherein to the washing liquor are added substantially simultaneously: (a) at least one inorganic salt derived from carbon dioxide inclusive hydrates, perhydrates and percarbonates thereof (b) at least one acidic compound devoid of formation of a precipitate with the calcium and magnesium ions in the washing liquor at usual dosage (c) at least one surface active compound devoid of formation of a precipitate with the calcium and magnesium ions in the washing liquor at usual dosage, the ratio of these components being such that the pH of the resulting washing liquor is maintained throughout the complete washing cycle within the range of 5 to 8, and the components (a) and (b) being added physically separated.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein component (a) is added physically separated and distinct from, and substantially simultaneously with component (b) to the washing liquor.
Claim 4
Dependent Claim
19 words
A method according to claim 1, wherein at least one of the components (a) and (b) is added separately.
Claim 5
Dependent Claim
30 words
A method according to claim 2, wherein components (a) and (b) are added in one batch, at least one of them being physically separated from the other components by impregnation.
Claim 6
Dependent Claim
33 words
A method according to claim 2, wherein components (a) and (b) are added in one batch, at least one of them being physically separated from the other components by a water soluble coating.
Claim 7
Dependent Claim
26 words
A method according to claim 1, wherein a proteolytic enzyme is added and the temperature of the washing liquor is kept at at most 60° C.
Claim 8
Dependent Claim
23 words
A method according to claim 1, wherein from 0.05 to 1% by weight of a sequestrant for iron and trace elements is added.
References Cited (Backward Citations)
US3761415A
Cited
US3850852A
Cited
US3996149A
Cited
GB1424406A
Cited
US3723327A
Cited
GB1437950A
Cited
GB2007704A
Cited
US4210550A
Cited
US4234442A
Cited
US4243543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |