US3633340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of oil-laden air
Assignee: Evening News Publishing Co
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Filing: 1970-01-27
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Granted: 1972-01-11
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Expires: 1990-01-27
Abstract
Abstract Oil-laden air from machine shops and kitchens and the like is purified by scrubbing with an aqueous solution of a nonionic wetting agent as the air is drawn through a spray chamber. In such a process, entrained oily matter often constituting a health and fire hazard is removed from the air.
Inventors
- 👤 Robert H Illingworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:28
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06; B01D53/00; B01D53/34; B01D2221/00; B01D2221/02; Y; Y10; Y10S; Y10S55/00; Y10S55/30; Y10S55/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
39 words
The process of claim 1 wherein said air is from a high-speed machine factory or a room in which comestibles are prepared and said aqueous solution contains about 0.005 to about 0.25 percent by weight of said wetting agent.
Claim 2
Dependent Claim
16 words
The process of claim 2 wherein said foreign particles comprise oil produced in high-speed machining operations.
Claim 3
Independent Claim
106 words
A method for removing oily foreign particles selected from the group consisting of mineral oils, fuel oils, lubricants derived from petroleum, fatty substances of vegetable and animal organisms and glycerol esters of fatty acids from air which comprises directing said air through a spray chamber, continuously wetting said air with a spray of an aqueous solution consisting essentially of water and a small effective amount but less than 1.0 percent by weight of a water-soluble nonionic wetting agent, said wetting agent having the structural formula wherein n is an integer between 8 and 15, and separating from said air said aqueous solution containing said foreign particles.
Claim 4
Dependent Claim
52 words
The process of claim 4 wherein said air is from a high-speed machine factory or a room in which said air is from a high-speed machine factory or a room in which comestibles are prepared and said aqueous solution contains about 0.005 to about 0.25 percent by weight of said wetting agent.
Claim 5
Dependent Claim
16 words
The process of claim 5 wherein said foreign particles comprise oil produced in high-speed machining operations.
Claim 6
Independent Claim
138 words
A method for removing oily foreign particles selected from the group consisting of mineral oils, fuel oils, lubricants derived from petroleum, fatty substances of vegetable and animal organisms and glycerol esters of fatty acids from air which comprises directing said air through a spray chamber and continuously wetting said air with an aqueous solution consisting essentially of water and a small effective amount of about 0.005 to about 1 percent by weight of a water-soluble nonionic wetting agent corresponding to the formula R-(CHR1-CHR1-O)n-H wherein R represents the residue of an alkyl phenol in which the total number of carbon atoms is between 7 and 24, R1 is a member selected from the group consisting of hydrogen and lower alkyl, and n an integer of from 4 to 30, which wetting agent removes said foreign particles from said air.
Claim 7
Dependent Claim
40 words
The process of claim 7 wherein said air is from a high-speed machine factory or a room in which comestibles are prepared and said aqueous solution contains between about 0.005 to about 0.25 percent by weight of said wetting agent.
Claim 8
Independent Claim
100 words
A method for removing oily foreign particles selected from the group consisting of mineral oils, fuel oils, lubricants derived from petroleum, fatty substances of vegetable and animal organisms and glycerol esters of fatty acids from air which comprises directing said air through a spray chamber and continuously wetting said air with an aqueous solution consisting essentially of water and effective amount of between 0.005 and about 1.0 percent by weight of a water-soluble nonionic wetting agent, said wetting agent consisting essentially of an ethylene oxide adduct of dodecyl phenol having between about 8 and 15 ethylene oxide groups per molecule.
Claim 9
Dependent Claim
39 words
The process of claim 9 wherein said air is from a high-speed machine factory or a room in which comestibles are prepared and said aqueous solution contains about 0.005 to about 0.25 percent by weight of said wetting agent.
Claim 10
Dependent Claim
17 words
The process of claim 10 wherein said oily foreign particles comprise oil produced in high-speed machining operations.
Claim 11
Dependent Claim
63 words
A method as defined in claim 1 including the steps of directing said air through a filter element, entrapping said particles in said element, continuously wetting said air and said filter element with a spray of said aqueous solution, the continuous wetting removing said entrapped foreign particles from said filter element and separating from said air said aqueous solution containing said foreign particles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |