Patent US4303542A successfully refreshed from Google Patents.
US4303542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powdered detergent or soak
Assignee: Individual
•
Filing: 1979-07-13
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Granted: 1981-12-01
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Expires: 1999-07-13
Abstract
Abstract A powdered detergent suitable for use in home laundry machines contains (1) an acid component which provides an initial wash solution with a pH of 1-4 and (2) a coated alkali-supplying substance which neutralizes the acid wash solution within a period of about 2 to 25 minutes. The compositions may be free of phosphates and avoid the problem of ash build-up on fabrics usually caused by carbonate-based non-phosphate detergents.
Inventors
- 👤 Karl H. Heinlein
- 👤 Joachim Busch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:45
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/0039; C11D2111/00; C11D2111/10; C11D2111/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
174 words
Powdered detergent or soak particularly for use in one of a preliminary and main washing cycle of household machines and laundry machines for washing in a phosphate-free wash liquor, which detergent forms with water an acid wash liquor with a pH of 1-4, and contains one or more solid or pseudo-solid acids, in addition to wash-active substances, characterized in that the detergent contains powdered portions, by means of which the acid wash liquor is neutralized or alkalized substantially or completely by itself within a period of about 2 to 25 minutes, and that these portions comprise one or more alkali-supplying substances from the group: sodium metasilicate, soda, water-glass, calcium oxide, magnesium oxide, magnesium oxychloride, calcium carbonate and magnesium carbonate, which substances are at least partly coated with one of a film that dissolves in the acid wash liquor and a non-ionic surfactant, wherein the detergent or soak specifically includes as at least part of the alkali supplying substance 8-25% by weight magnesium carbonate, 1-13% by weight magnesium oxide and 0-20% by weight calcium carbonate.
Claim 2
Dependent Claim
174 words
Powdered detergent or soak particularly for use in one of a preliminary and main washing cycle of household machines and laundry machines for washing in a phosphate-free wash liquor, which detergent forms with water an acid wash liquor with a pH of 1-4, and contains one or more solid or pseudo-solid acids, in addition to wash-active substances, characterized in that the detergent contains powdered portions, by means of which the acid wash liquor is neutralized or alkalized substantially or completely by itself within a period of about 2 to 25 minutes, and that these portions comprise one or more alkali-supplying substances from the group: sodium metasilicate, soda, water-glass, calcium oxide, magnesium oxide, magnesium oxychloride, calcium carbonate and magnesium carbonate, which substances are at least partly coated with one of a film that dissolves in the acid wash liquor and a non-ionic surfactant, wherein the detergent or soak specifically includes as at least part of the alkali supplying substance 8-25% by weight magnesium carbonate, 1-13% by weight magnesium oxide and 0-20% by weight calcium carbonate.
Claim 3
Dependent Claim
16 words
Detergent or soak according to claim 1, wherein the coating is 2-25% by weight non-ionic surfactants.
Claim 4
Dependent Claim
21 words
Detergent or soak according to claim 1, characterized in that the portion of anionic surfactants is 0 to 10% by weight.
Claim 5
Dependent Claim
31 words
Detergent or soak according to claim 1, characterized in that it contains about 0.5 to about 3% of one of sodium bisulfite and sodium pyrosulfite as an acid reductive bleaching agent.
Claim 6
Dependent Claim
21 words
Detergent or soak according to claim 1, characterized in that the portion of anionic surfactants is 0 to 10% by weight.
Claim 7
Dependent Claim
17 words
Detergent or soak according to claim 1, wherein the magnesium carbonate is 11 to 22% by weight.
Claim 8
Dependent Claim
17 words
Detergent or soak according to claim 1, wherein the magnesium oxide is 5 to 8% by weight.
Claim 9
Dependent Claim
17 words
Detergent or soak according to claim 1, wherein the magnesium carbonate is 5 to 8% by weight.
Claim 10
Dependent Claim
17 words
Detergent or soak according to claim 1, wherein the non-ionic surfactants are 4 to 20% by weight.
Claim 11
Dependent Claim
161 words
Powdered detergent or soak particularly for use in one of a preliminary and main washing cycle of household machines and laundry machines for washing in a phosphate-free wash liquor, which detergent forms with water an acid wash liquor with a pH of 1-4, and contains one or more solid or pseudo-solid acids, in addition to wash-active substances, characterized in that the detergent contains powdered portions, by means of which the acid wash liquor is neutralized or alkalized substantially or completely by itself within a period of about 2 to 25 minutes, and that these portions comprise one or more alkali-supplying substances from the group: sodium metasilicate, soda, water-glass, calcium oxide, magnesium oxide, magnesium oxychloride, calcium carbonate and magnesium carbonate, which substances are at least partly coated with a non-ionic surfactant wherein the detergent or soak specifically includes as at least part of the alkali-supplying substance 8-25% by weight magnesium carbonate, 0-13% by weight magnesium oxide and 0-20% by weight calcium carbonate.
Claim 12
Dependent Claim
161 words
Powdered detergent or soak particularly for use in one of a preliminary and main washing cycle of household machines and laundry machines for washing in a phosphate-free wash liquor, which detergent forms with water an acid wash liquor with a pH of 1-4, and contains one or more solid or pseudo-solid acids, in addition to wash-active substances, characterized in that the detergent contains powdered portions, by means of which the acid wash liquor is neutralized or alkalized substantially or completely by itself within a period of about 2 to 25 minutes, and that these portions comprise one or more alkali-supplying substances from the group: sodium metasilicate, soda, water-glass, calcium oxide, magnesium oxide, magnesium oxychloride, calcium carbonate and magnesium carbonate, which substances are at least partly coated with a non-ionic surfactant wherein the detergent or soak specifically includes as at least part of the alkali-supplying substance 8-25% by weight magnesium carbonate, 0-13% by weight magnesium oxide and 0-20% by weight calcium carbonate.
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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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |