US3686827A
Expired / Lapsed
US
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Removal of organic vapors from gas
Assignee: Dow Chemical Co
•
Filing: 1970-10-16
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Granted: 1972-08-29
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Expires: 1990-10-16
Abstract
Abstract Alkylstyrene polymer particles are used as an absorbent for organic vapors and are particularly effective for removing organic vapors from air.
Inventors
- 👤 Daniel H Haigh
- 👤 Richard H Hall
- 👤 Clarence E Lange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:33
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01J; B01J20/00; B01J20/22; F; F01; F01N; F01N3/00; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
26 words
The method of claim 1 wherein the alkylstyrene polymer comprises a polymer of an alkylstyrene which has alkyl groups containing from four to 20 carbon atoms.
Claim 2
Dependent Claim
16 words
The method of claim 2 wherein the alkyl group contains from four to 12 carbon atoms.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the alkylstyrene polymer has polymerized therewith a crosslinking agent.
Claim 4
Dependent Claim
21 words
The method of claim 4 wherein the crosslinking agent is within a range of from about 0.01 to 2 weight percent.
Claim 5
Dependent Claim
29 words
The method of claim 1 wherein the weight percent of alkylstyrene within the polymer is 100/n wherein n is the number of carbon atoms in the alkyl side chain.
Claim 6
Dependent Claim
29 words
The method of claim 1 wherein the weight percent of alkylstyrene within the polymer is 200/n wherein n is the number of carbon atoms in the alkyl side chain.
Claim 7
Dependent Claim
14 words
The method of claim 1 wherein the alkylstyrene polymer is a polymer of t-butylstyrene.
Claim 8
Dependent Claim
16 words
The method of claim 8 wherein the alkylstyrene polymer is a polymer of t-butylstyrene and methylmethacrylate.
Claim 9
Dependent Claim
11 words
The method of claim 1 wherein the carrier gas is air.
Claim 10
Dependent Claim
12 words
The method of claim 10 wherein the vapor is a hydrocarbon vapor.
Claim 11
Dependent Claim
15 words
The method of claim 1 wherein the carrier gas and organic material is tobacco smoke.
Claim 12
Independent Claim
48 words
A method for the separation of organic vapors from air, the steps of the method comprising providing a gas and vapor permeable body of an alkylstyrene polymer, passing through said body air containing organic vapor, thereby removing at least a portion of the organic vapor from the air.
Claim 13
Independent Claim
70 words
A method for the separation of organic vapors from air, the steps of the method consisting essentially of providing a gas impermeable body of an alkylstyrene polymer wherein the alkylstyrene polymer comprises a polymer of an alkylstyrene which has alkyl groups containing from four to 20 carbon atoms, passing through said body air containing an organic vapor, thereby removing at least a portion of the organic vapor from the air.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |