US4935065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphate-free alkaline detergent for cleaning-in-place of food processing equipment
Assignee: Ecolab Inc
•
Filing: 1987-12-07
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Granted: 1990-06-19
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Expires: 2007-12-07
Abstract
Abstract Aqueous alkaline cleaning concentrates and wash solutions are disclosed which comprise an alkali metal hydroxide, a water-conditioning acrylic polymer, an active chlorine source and a fatty or oily soil-dispersing amount of a low molecular weight aliphatic phosphonic acid containing at least two groups capable of forming anions under conditions of high pH, at least one of which is a phosphonic acid group. The wash solutions are particularly useful to clean cleaned-in-place food-processing equipment which has been fouled with greasy or oily soils.
Inventors
- 👤 Sandra L. Bull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:22
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/36; C11D3/395; C11D3/3956; C11D7/00; C11D7/22; C11D7/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
64 words
An aqueous alkaline cleaning concentrate effective to disperse and degrade fatty or oily soil comprising a solution of: (a) about 15% sodium hydroxide; (b) about 0.8% 2-phosphonobutane-1,2,4-tricarboxylic acid; (c) about 2.7% sodium polyacrylate having a molecular weight ranging from about 1000 to 6000; (d) about 3.0% sodium hypochlorite; and (e) the balance comprising water wherein said concentrate is free of inorganic condensed phosphate salts.
Claim 2
Dependent Claim
64 words
An aqueous alkaline cleaning concentrate effective to disperse and degrade fatty or oily soil comprising a solution of: (a) about 15% sodium hydroxide; (b) about 0.8% 2-phosphonobutane-1,2,4-tricarboxylic acid; (c) about 2.7% sodium polyacrylate having a molecular weight ranging from about 1000 to 6000; (d) about 3.0% sodium hypochlorite; and (e) the balance comprising water wherein said concentrate is free of inorganic condensed phosphate salts.
Claim 3
Dependent Claim
83 words
A clean-in-place wash solution formed by diluting an aqueous alkaline cleaning concentrate effective to disperse and degrade fatty or oily soil, the concentrate comprising: (a) about 15% sodium hydroxide; (b) about 2.7% sodium polyacrylate having a molecular weight ranging from about 1000 to 6000; (c) about 0.8% of 2-phosphonobutane-1,2,4-tricarboxylic acid; (d) about 3.0% sodium hypochlorite; and (e) the balance water wherein said concentrate is free of inorganic condensed phosphate salts and is diluted to about 0.1% to 10% to form said wash solution.
Claim 4
Dependent Claim
83 words
A clean-in-place wash solution formed by diluting an aqueous alkaline cleaning concentrate effective to disperse and degrade fatty or oily soil, the concentrate comprising: (a) about 15% sodium hydroxide; (b) about 2.7% sodium polyacrylate having a molecular weight ranging from about 1000 to 6000; (c) about 0.8% of 2-phosphonobutane-1,2,4-tricarboxylic acid; (d) about 3.0% sodium hypochlorite; and (e) the balance water wherein said concentrate is free of inorganic condensed phosphate salts and is diluted to about 0.1% to 10% to form said wash solution.
Claim 5
Dependent Claim
121 words
A process for cleaning food processing, storage and preparation equipment fouled with fatty or oily soil comprising: (a) dissolving about 0.1-10 parts by weight of a liquid cleaning concentrate and about 100 parts by weight of water to form an aqueous solution, said concentrate comprising: (i) about 15% sodium hydroxide; (ii) about 2.7% sodium polyacrylate having a molecular weight ranging from about 1000 to 6000; (iii) about 0.8% of 2-phosphonobutane-1,2,4-tricarboxylic acid; (iv) about 3.0% sodium hypochlorite; and (v) the balance being water, wherein said wash solution is free of inorganic condensed phosphate salts; and (b) contacting said aqueous solution with the fouled article in a recirculating clean-in-place system for a period of time effective to disperse said fatty or oily soil.
Claim 6
Dependent Claim
121 words
A process for cleaning food processing, storage and preparation equipment fouled with fatty or oily soil comprising: (a) dissolving about 0.1-10 parts by weight of a liquid cleaning concentrate and about 100 parts by weight of water to form an aqueous solution, said concentrate comprising: (i) about 15% sodium hydroxide; (ii) about 2.7% sodium polyacrylate having a molecular weight ranging from about 1000 to 6000; (iii) about 0.8% of 2-phosphonobutane-1,2,4-tricarboxylic acid; (iv) about 3.0% sodium hypochlorite; and (v) the balance being water, wherein said wash solution is free of inorganic condensed phosphate salts; and (b) contacting said aqueous solution with the fouled article in a recirculating clean-in-place system for a period of time effective to disperse said fatty or oily soil.
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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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |