US3985922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for washing paint overspray from air
Assignee: In Virechem Inc
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Filing: 1971-08-12
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Granted: 1976-10-12
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Expires: 1991-08-12
Abstract
Abstract Disclosed are compositions useful as deflocculants in recirculated aqueous systems utilized in the removal of paint sprays from air. These compositions comprise (a) a first component selected from water soluble salts of polyaminopolycarboxylic acids; water soluble salts of nitrilotriacetic acid; and mixtures thereof; (b) a second component selected from triethanolamine; water soluble salts of oxalic acid, tartaric acid, citric acid; gluconic acid and glucoheptonic acid; and mixtures thereof; and (c) a third component selected from sodium hydroxide, potassium hydroxide and mixtures thereof. Water systems containing small amounts of these compositions have a capacity of dissolving and dispersing large quantities of paint wastes.
Inventors
- 👤 Robert H. Thornton
- 👤 Bryce Chambers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:16
CPC Classifications
C; C09; C09D; C09D7/00; C09D7/71; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
127 words
A process for washing paint overspray from air comprising contacting said overspray with an aqueous solution comprising at least 0.004% by weight of a first component selected from the group consisting of water soluble salts of polyaminopolycarboxylic acids, water soluble salts of nitrilotriacetic acid, and mixtures thereof; a second component selected from the group consisting of sodium hydroxide, potassium hydroxide and mixtures thereof, the amount of said second component being such that said solution has a pH of at least 10; and at least 0.006% by weight of a third component selected from the group consisting of triethanolamine, water soluble salts of oxalic acid, tartaric acid, citric acid, gluconic acid and glucoheptonic acid, and mixtures thereof; whereby said overspray becomes entrained in said solution and dispersed therein.
Claim 2
Dependent Claim
127 words
A process for washing paint overspray from air comprising contacting said overspray with an aqueous solution comprising at least 0.004% by weight of a first component selected from the group consisting of water soluble salts of polyaminopolycarboxylic acids, water soluble salts of nitrilotriacetic acid, and mixtures thereof; a second component selected from the group consisting of sodium hydroxide, potassium hydroxide and mixtures thereof, the amount of said second component being such that said solution has a pH of at least 10; and at least 0.006% by weight of a third component selected from the group consisting of triethanolamine, water soluble salts of oxalic acid, tartaric acid, citric acid, gluconic acid and glucoheptonic acid, and mixtures thereof; whereby said overspray becomes entrained in said solution and dispersed therein.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein said solution is comprised of at least 0.01% by weight of said third component.
Claim 4
Dependent Claim
38 words
The process of claim 2 wherein said third component consists of triethanolamine and at least one compound selected from the group consisting of alkali metal salts of oxalic acid, tartaric acid, citric acid, gluconic acid and glucoheptonic acid.
Claim 5
Dependent Claim
20 words
The process of claim 3 wherein said solution is comprised of at least 0.01% by weight of said third component.
Claim 6
Dependent Claim
135 words
A process for washing paint overspray from air comprising contacting said overspray with an aqueous solution comprising at least 0.01% by weight of a first component selected from the group consisting of water soluble salts of ethylenediaminetetraacetic acid, hydroxyethylethylenediaminetriacetic acid, nitrilotriacetic acid, diethylenetriamine pentaacetic acid and mixtures thereof; a second component selected from the group consisting of sodium hydroxide, potassium hydroxide and mixtures thereof, the amount of said second component being such that said solution has a pH of at least 11; and at least 0.01% by weight of a third component consisting of a mixture of triethanolamine and at least one compound selected from the group consisting of water soluble salts of oxalic acid, tartaric acid, citric acid, gluconic acid and glucoheptonic acid, whereby the overspray becomes entrained in said solution and dispersed therein.
Claim 7
Dependent Claim
135 words
A process for washing paint overspray from air comprising contacting said overspray with an aqueous solution comprising at least 0.01% by weight of a first component selected from the group consisting of water soluble salts of ethylenediaminetetraacetic acid, hydroxyethylethylenediaminetriacetic acid, nitrilotriacetic acid, diethylenetriamine pentaacetic acid and mixtures thereof; a second component selected from the group consisting of sodium hydroxide, potassium hydroxide and mixtures thereof, the amount of said second component being such that said solution has a pH of at least 11; and at least 0.01% by weight of a third component consisting of a mixture of triethanolamine and at least one compound selected from the group consisting of water soluble salts of oxalic acid, tartaric acid, citric acid, gluconic acid and glucoheptonic acid, whereby the overspray becomes entrained in said solution and dispersed therein.
Claim 8
Dependent Claim
23 words
The process of claim 5 wherein said third component consists of a mixture of triethanolamine and a water soluble salt of gluconic acid.
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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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |