US3593496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for purifying gases
Assignee: Boston Children's Hospital
•
Filing: 1969-09-10
•
Granted: 1971-07-20
•
Expires: 1989-09-10
Abstract
Abstract Organic pollutants, such as hydrocarbons, can be removed from air by mixing the air with an aerosol of particles of water containing a surfactant which presents an oleophilic surface on the particles. The air is preferably humidified to 100 percent RH prior to mixing it with the aerosol, so that evaporation of the aerosol particles will not occur. The aerosol particles are effective by absorbing organic pollutants into their oleophilic surfaces, and removal of the particles by filtration or electrostatic precipitation leaves the air substantially purified of such pollutants.
Inventors
- 👤 Edward W Merrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:50
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/72; A; A61; A61L; A61L9/00; A61L9/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
12 words
The process of claim 1 wherein the oleophilic surface comprises a lecithin.
Claim 2
Dependent Claim
13 words
The process of claim 2 wherein the lecithin is DL dipalmitoyl- Alpha -lecithin.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the gas is air.
Claim 4
Dependent Claim
10 words
The process of claim 2 wherein the gas is air.
Claim 5
Dependent Claim
35 words
The process of claim 1 wherein the concentration of said aerosol is such that the mean center-to-center distance between aerosol particles is between 10 and 100 times the mean free path of the pollutant molecules.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein the relative humidity of the inorganic gas contacted with the aerosol is substantially 100 percent.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |