Patent US5268119A successfully refreshed from Google Patents.
US5268119A
Expired / Lapsed
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Machine dishwashing detergent having a reduced condensed phosphate content
Assignee: Church and Dwight Co Inc
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Filing: 1991-10-11
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Granted: 1993-12-07
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Expires: 2011-10-11
Abstract
Abstract The present invention is based upon the discovery that high levels of carbonate salts can be formulated with minor concentrations of phosphates (e.g., about 0.1 to 0.3 percent by weight as expressed as (P 2 O 5 ) ion) together with low levels of polycarboxylate homopolymers and copolymers (i.e., about 0.5 to 5.0 percent by weight) in a dishwashing detergent formulation while providing satisfactory cleaning without unacceptable spotting and filming and without the need to add a chlorinating agent.
Inventors
- 👤 Madeline P. Simpson
- 👤 Raymond S. Brown
- 👤 Anthony Winston
- 👤 Louis Kubian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:24
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/06; C11D3/10; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3761
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A low phosphate automatic dishwashing composition comprising from about 50 to 95 percent by weight of alkali metal carbonate and bicarbonate salts wherein such salts comprise a weight ratio of about 1:1 to 1:10 carbonate to bicarbonate, a sufficient amount of an alkaline condensed phosphate salt to provide from about 0.1 to 1.5 percent by weight of (P 2 O 5 ) ion, from about 3 to 5.0 percent by weight of polycarboxylate polymer of molecular weight from 1,000 to 1,000,000, and from about 0.5 to 5.0 percent by weight of a nonionic surfactant.
Claim 2
Dependent Claim
94 words
A low phosphate automatic dishwashing composition comprising from about 50 to 95 percent by weight of alkali metal carbonate and bicarbonate salts wherein such salts comprise a weight ratio of about 1:1 to 1:10 carbonate to bicarbonate, a sufficient amount of an alkaline condensed phosphate salt to provide from about 0.1 to 1.5 percent by weight of (P 2 O 5 ) ion, from about 3 to 5.0 percent by weight of polycarboxylate polymer of molecular weight from 1,000 to 1,000,000, and from about 0.5 to 5.0 percent by weight of a nonionic surfactant.
Claim 3
Dependent Claim
36 words
The composition of claim 1 wherein said composition contains from about 1.0 to 3.0 percent by weight of a foam-suppressing nonionic surfactant and from about 0 to about 6.0 percent by weight of an oxygen bleach.
Claim 4
Dependent Claim
23 words
The composition of claim 1 wherein the alkali metal carbonate and bicarbonate salts comprise a weight ration of about 1:3 carbonate to bicarbonate.
Claim 5
Dependent Claim
18 words
The composition of claim 1 wherein the alkali metal carbonate is sodium carbonate, potassium carbonate, or mixtures thereof.
Claim 6
Dependent Claim
18 words
The composition of claim 1 wherein the alkali metal bicarbonate is sodium bicarbonate, potassium bicarbonate, or mixtures thereof.
Claim 7
Dependent Claim
19 words
The composition of claim 1 wherein the alkali condensed phosphate salt is sodium or potassium tripolyphosphate, hexametaphosphate or pyrophosphate.
Claim 8
Dependent Claim
22 words
The composition of claim 1 wherein the polycarboxylate polymer is an alkali metal or ammonium salt of acrylic or methacrylic polyelectrolyte polymers.
Claim 9
Dependent Claim
19 words
The composition of claim 1 wherein the polycarboxylate polymer is a water-soluble salt of an aliphatic hydroxy polycarboxcylic acid.
Claim 10
Dependent Claim
14 words
The composition of claim 2 wherein an activator is employed with said oxygen bleach.
Claim 11
Dependent Claim
19 words
The composition of claim 1 wherein up to about 8 percent by weight of a corrosion inhibitor is employed.
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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) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |