Patent US2717957A successfully refreshed from Google Patents.
US3847663A
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US
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Cleaning of metals with compositions containing alkali metal silicate and chloride
Assignee: MAN-GILL CHEMICAL COMPANY AN OH CORP
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Filing: 1972-07-19
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Granted: 1974-11-12
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Expires: 1992-07-19
Abstract
Abstract Metal surfaces are cleaned, prior to phosphating or the like, with compositions containing alkali metal (especially sodium) silicates and chlorides, and preferably also containing surfactants and chelating agents. These compositions have cleaning power comparable to phosphate-containing cleaners and cause less water pollution upon discharge into natural waterways.
Inventors
- 👤 G Shumaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:47
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/78; C23C22/80; C23G; C23G1/00; C23G1/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
59 words
A METHOD FOR CLEANING THE SURFACE OF METALS DURING PROCESSING THEREOF WHICH COMPRISES CONTACTING SAID SURFACE AT A TEMPERATURE OF ABOUT 50*-100*C WITH AN AQUEOUS CLEANING COMPOSITION IN THE LIQUID STATE WHEREIN THE ACTIVE INGREDIENTS COMPRISE WATER-SOLUBLE ALKALI METAL SILICATE AND ALKALI METAL CHLORIDE, THE WEIGHT RATIO OF SAID SILICATE TO SAID CHLORIDE BEING BETWEEN ABOUT 4:1 AND 10:1.
Claim 2
Independent Claim
59 words
A METHOD FOR CLEANING THE SURFACE OF METALS DURING PROCESSING THEREOF WHICH COMPRISES CONTACTING SAID SURFACE AT A TEMPERATURE OF ABOUT 50*-100*C WITH AN AQUEOUS CLEANING COMPOSITION IN THE LIQUID STATE WHEREIN THE ACTIVE INGREDIENTS COMPRISE WATER-SOLUBLE ALKALI METAL SILICATE AND ALKALI METAL CHLORIDE, THE WEIGHT RATIO OF SAID SILICATE TO SAID CHLORIDE BEING BETWEEN ABOUT 4:1 AND 10:1.
Claim 3
Dependent Claim
12 words
A method according to claim 1 wherein the alkali metal is sodium.
Claim 4
Dependent Claim
41 words
A method according to claim 2 wherein the cleaning composition additionally contains at least one non-ionic or amphoteric surfactant and a chelating agent, each being present in the amount of about 3-10 parts by weight per 100 parts of active ingredients.
Claim 5
Dependent Claim
18 words
A method according to claim 3 wherein the chelating agent is ethylenediaminetetraacetic acid or a water-soluble salt thereof.
Claim 6
Dependent Claim
75 words
A method according to claim 2 wherein the active ingredients in said cleaning composition consist essentially of about 65-80 parts by weight of sodium metasilicate, about 5-15 parts of sodium chloride, about 5-15 parts of sodium carbonate, about 0-10 parts of ethylenediaminetetraacetic acid or a water-soluble salt thereof, and about 4-10 parts of at least one non-ionic or amphoteric surfactant, said ingredients being dissolved in water to a concentration of about 5-20 grams per liter.
Claim 7
Dependent Claim
20 words
A method accordIng to claim 5 wherein the composition additionally contains about 4-10 parts by weight of colloidal titanium phosphate.
References Cited (Backward Citations)
US2044467A
Cited
US2322349A
Cited
US2440837A
Cited
US2490062A
Cited
US3090709A
Cited
US2956026A
Cited
GB935733A
Cited
US3368978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |