Patent US4261709A successfully refreshed from Google Patents.
US4261709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agent for the removal of low molecular weight organic gases
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1979-06-22
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Granted: 1981-04-14
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Expires: 1999-06-22
Abstract
Abstract A carbonaceous molecular sieve having micropores with diameters in the range of 4 to 6 Angstrom units and bromine as adsorbed on said carbonaceous molecular sieve is able to remove selectively low molecular weight organic gases such as ethylene, acetylene, methyl sulfide, acetaldehyde etc. from air and other gases containing the same with a reduced tendency toward deactivation with time, and is useful as a removing agent of low molecular weight organic gases.
Inventors
- 👤 Kiyoshi Itoga
- 👤 Fumiichi Ogino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:32
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/20; B01D; B01D53/00; B01D53/02; Y; Y10; Y10S; Y10S95/00; Y10S95/90; Y10S95/902; Y10S95/903
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
A process for removal of a low molecular weight organic gas selected from the group consisting of olefines having 2 to 3 carbon atoms and alkyl sulfides having 2 to 3 carbon atoms from air containing said gas, which process comprises contacting the air with a carbonaceous molecular sieve in which the volume of micropores having diameters in the range of 4 to 6 Angstrom units is not less than 80% of the total volume of micropores, said carbonaceous molecular sieve having bromine supported thereon.
Claim 2
Dependent Claim
85 words
A process for removal of a low molecular weight organic gas selected from the group consisting of olefines having 2 to 3 carbon atoms and alkyl sulfides having 2 to 3 carbon atoms from air containing said gas, which process comprises contacting the air with a carbonaceous molecular sieve in which the volume of micropores having diameters in the range of 4 to 6 Angstrom units is not less than 80% of the total volume of micropores, said carbonaceous molecular sieve having bromine supported thereon.
Claim 3
Dependent Claim
32 words
A process as claimed in claim 1, wherein the amount of bromine to be supported on the carbonaceous molecular sieve is 2 to 30 weight percent relative to the carbonaceous molecular sieve.
Claim 4
Dependent Claim
32 words
A process as claimed in claim 1, wherein the amount of bromine to be supported on the carbonaceous molecular sieve is 5 to 20 weight percent relative to the carbonaceous molecular sieve.
Claim 5
Dependent Claim
31 words
A process as claimed in claim 1, wherein the carbonaceous molecular sieve having bromine supported thereon is prepared by contacting a carrier gas containing gaseous bromine with the carbonaceous molecular sieve.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 1, wherein the low molecular weight organic gas is methyl sulfide, ethylene or propylene.
Claim 7
Dependent Claim
80 words
A removing agent for the removal of a low molecular weight organic gas selected from the group consisting of olefines having 2 to 3 carbon atoms and alkyl sulfides having 2 to 3 carbon atoms, which removing agent comprises a carbonaceous molecular sieve and bromine as adsorbed on said carbonaceous molecular sieve in which the volume of micropores having diameters in the range of 4 to 6 Angstrom units is not less than 80% of the total volume of micropores.
Claim 8
Dependent Claim
80 words
A removing agent for the removal of a low molecular weight organic gas selected from the group consisting of olefines having 2 to 3 carbon atoms and alkyl sulfides having 2 to 3 carbon atoms, which removing agent comprises a carbonaceous molecular sieve and bromine as adsorbed on said carbonaceous molecular sieve in which the volume of micropores having diameters in the range of 4 to 6 Angstrom units is not less than 80% of the total volume of micropores.
Claim 9
Dependent Claim
21 words
A removing agent as claimed in claim 6, wherein the low molecular weight organic gas is methyl sulfide, ethylene or propylene.
Claim 10
Dependent Claim
33 words
A removing agent as claimed in claim 6, wherein the amount of bromine to be adsorbed on the carbonaceous molecular sieve is 2 to 30 weight percent relative to the carbonaceous molecular sieve.
Claim 11
Dependent Claim
33 words
A removing agent as claimed in claim 6, wherein the amount of bromine to be adsorbed on the carbonaceous molecular sieve is 5 to 20 weight percent relative to the carbonaceous molecular sieve.
Claim 12
Dependent Claim
28 words
A removing agent as claimed in claim 6, wherein the removing agent is one prepared by contacting a carrier gas containing gaseous bromine with the carbonaceous molecular sieve.
References Cited (Backward Citations)
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US3962129A
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US4040802A
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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) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |