US3879216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for cleaning surfaces
Assignee: Austinite Corp
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Filing: 1972-09-25
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Granted: 1975-04-22
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Expires: 1992-09-25
Abstract
Abstract A method and formulations for cleaning painted aluminum siding and other metal, organic resin and the like surfaces comprising applying to the surface a layer containing a water-insoluble finely divided absorbent material and an oxide remover solution such as an aqueous acidic solution containing a phosphate radical and after the first layer has dried applying thereover a second layer which contains water-insoluble finely divided solid absorbent material in a liquid mixture including a water-soluble organic solvent and a compound selected from the group consisting of sodium nitrite, soluble silicates, and a water-insoluble organic solvent and after the first layer has been absorbed through the first layer removing the layers as by washing with water. The invention has special utility for cleaning and preparing architectural aluminum siding for refinishing with paint or other protective coatings.
Inventors
- 👤 Sigmund N Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:37
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/12; C23G1/125; B; B08; B08B; B08B3/00; B08B3/04; B08B3/08; B08B7/00; B08B7/0014; C09; C09D; C09D9/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
118 words
A METHOD FOR CLEANING A SURFACE COMPRISING APPLYING TO THE SURFACE A FIRST COATING OF A SLURRY OF A WATER-INSOLUBLE FINELY DIVIDED SOLIDS ABSORBENT MATERIAL IN AN AQUEOUS ACIDIC SOLUTION CONTAINING PHOSPHATE RADICAL, A CHLEATING AGENT AND A SURFACTANT; AFTER SAID SLURRY HAS DRIED APPLYING TO SAID COATING A COATING OF A SECOND SLURRY OF WATER-INSOLUBLE FINELY DIVIDED SOLID ABSORBENT MATERIAL IN A LIQUID COMPRISING A MIXTURE OF (A) A SECOND AQUEOUS SOLUTION COMPRISING A CHELATING AGENT, A SURFACTANT, WATER-SOLUBLE ORGANIC SOLVENT AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM NITRITE, SOLUBLE SILICATES AND MIXTURES THEREOF, AND (B) WATER-INSOLUBLE ORGANIC SOLVENT; AND AFTER SAID SECOND COATING HAS BEEN ABSORBED THROUGH SAID FIRST COATING REMOVING SAID COATINGS.
Claim 2
Independent Claim
118 words
A METHOD FOR CLEANING A SURFACE COMPRISING APPLYING TO THE SURFACE A FIRST COATING OF A SLURRY OF A WATER-INSOLUBLE FINELY DIVIDED SOLIDS ABSORBENT MATERIAL IN AN AQUEOUS ACIDIC SOLUTION CONTAINING PHOSPHATE RADICAL, A CHLEATING AGENT AND A SURFACTANT; AFTER SAID SLURRY HAS DRIED APPLYING TO SAID COATING A COATING OF A SECOND SLURRY OF WATER-INSOLUBLE FINELY DIVIDED SOLID ABSORBENT MATERIAL IN A LIQUID COMPRISING A MIXTURE OF (A) A SECOND AQUEOUS SOLUTION COMPRISING A CHELATING AGENT, A SURFACTANT, WATER-SOLUBLE ORGANIC SOLVENT AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM NITRITE, SOLUBLE SILICATES AND MIXTURES THEREOF, AND (B) WATER-INSOLUBLE ORGANIC SOLVENT; AND AFTER SAID SECOND COATING HAS BEEN ABSORBED THROUGH SAID FIRST COATING REMOVING SAID COATINGS.
Claim 3
Independent Claim
118 words
A method for cleaning a surface comprising applying tO the surface a first coating of a slurry of a water-insoluble finely divided solid absorbent material in an aqueous acidic solution containing phosphate radical, a chelating agent and a surfactant; after said slurry has dried applying to said coating a coating of a second slurry of water-insoluble finely divided solid absorbent material in a liquid comprising a mixture of (a) a second aqueous solution comprising a chelating agent, a surfactant, water-soluble organic solvent and a compound selected from the group consisting of sodium nitrite, soluble silicates and mixtures thereof, and (b) water-insoluble organic solvent; and after said second coating has been absorbed through said first coating removing said coatings.
Claim 4
Independent Claim
118 words
A method for cleaning a surface comprising applying tO the surface a first coating of a slurry of a water-insoluble finely divided solid absorbent material in an aqueous acidic solution containing phosphate radical, a chelating agent and a surfactant; after said slurry has dried applying to said coating a coating of a second slurry of water-insoluble finely divided solid absorbent material in a liquid comprising a mixture of (a) a second aqueous solution comprising a chelating agent, a surfactant, water-soluble organic solvent and a compound selected from the group consisting of sodium nitrite, soluble silicates and mixtures thereof, and (b) water-insoluble organic solvent; and after said second coating has been absorbed through said first coating removing said coatings.
Claim 5
Dependent Claim
14 words
The method of claim 1, wherein the phosphate radical is supplied by phosphoric acid.
Claim 6
Dependent Claim
30 words
The method of claim 2, wherein the chelating agent of the first slurry is an organic chelating acid selected from the group consisting of aliphatic carboxylic and aliphatic polycarboxylic acids.
Claim 7
Dependent Claim
40 words
The method of claim 2, wherein the chelating agent of the second slurry is selected from the group consisting of complex phosphates, ethylenediaminetetraacetic acid, nitrilotriacetic acid, sodium salts of ethylenediaminetetraacetic acid and nitrilotriacetic acid and mono, di, or tricarboxylic acids.
Claim 8
Dependent Claim
53 words
The method of claim 2, wherein the surfactants of both slurries are nonionic and are selected from the group consisting of alkylphenoxypoly (oxyethylene) ethanols resulting from a combination of an alkylphenol with ethylene oxide and having the general formula RC6H4O(CH2CH2O)nCH2Ch2OH in which R may be C8H17 or a higher homologue and n 7-9.
Claim 9
Dependent Claim
25 words
The method of claim 2, wherein the water-soluble solvent is selected from the group consisting of mono, di, or triethylene glycol ethers of primary alcohols.
Claim 10
Dependent Claim
27 words
The method of claim 1, wherein the compound of the second aqueous solution is a soluble silicate selected from the group consisting of sodium and potassium silicates.
Claim 11
Dependent Claim
16 words
The method of claim 1, wherein the compound of the second aqueous solution is sodium nitrite.
Claim 12
Dependent Claim
30 words
The method of claim 1, wherein the aqueous acidic solution contains in parts by weight 10-70 parts of phosphate radical, 2.5-4.0 parts of chelating agent and 1-3 parts of surfactant.
Claim 13
Dependent Claim
36 words
The method of claim 9, wherein the second aqueous solution contains in parts by weight 2.5-6.0 parts of soluble silicate, 2-5 parts of chelating agent, 1-5 parts of surfactant and 3-10 parts of water-soluble organic solvent.
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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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |