US3751879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for reducing the dissolved gas concentration in a liquid
Assignee: Instrumentation Specialties Co
•
Filing: 1971-04-26
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Granted: 1973-08-14
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Expires: 1991-04-26
Abstract
Abstract Apparatus for reducing the dissolved gas concentration in a liquid, for example, a liquid flowing in chromatographic system, utilizing the ability of the gas dissolved in the liquid to pass through a gas permeable membrane. The liquid is exposed to one surface of the membrane and the opposite surface of the membrane is provided with a coating of gas-soluble substance for increasing the permeability of the membrane and thereby enhancing the permeation of the gas through the membrane. Further, in various embodiments of the invention, a chamber is provided opposite or surrounding the coated membrane and, in accordance with the teachings of the present invention, the chamber may be vented to the atmosphere, evacuated and sealed or communicated to a means for establishing a pressure in the chamber sufficiently lower than the pressure of the liquid exposed to the membrane such that the permeation of the gas through the membrane is enhanced. Additionally, the chamber may be provided with absorbent or adsorbent material for accommodating gas permeated through the membrane.
Inventors
- 👤 R Allington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:14
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/34; B; B01; B01D; B01D19/00; B01D19/0031; G01N1/00; G01N1/28; G01N1/34; G01N1/40; G01N1/4005; G01N2001/4016
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
148 words
Gas removing apparatus comprising: a housing having a plurality of openings formed therein; tubular flow means within said housing having an inlet and outlet; inlet means for connecting said flow means inlet to a chromatographic column having a solvent with gas dissolved therein through a path free of introduced, undissolved gas; and outlet means for connecting the flow means outlet to an analyzing device; said tubular flow means including membrane means for lowering the dissolved gas concentration of the solvent to a level below the saturation level of the gas in the solvent; said membrane means including a membrane which is more permeable to the gas than to the solvent and a coat on said membrane in which said gas is soluble; said membrane having a first side and a second side; said first side being positioned to contact said solvent and said second side contacting said coat.
Claim 2
Dependent Claim
148 words
Gas removing apparatus comprising: a housing having a plurality of openings formed therein; tubular flow means within said housing having an inlet and outlet; inlet means for connecting said flow means inlet to a chromatographic column having a solvent with gas dissolved therein through a path free of introduced, undissolved gas; and outlet means for connecting the flow means outlet to an analyzing device; said tubular flow means including membrane means for lowering the dissolved gas concentration of the solvent to a level below the saturation level of the gas in the solvent; said membrane means including a membrane which is more permeable to the gas than to the solvent and a coat on said membrane in which said gas is soluble; said membrane having a first side and a second side; said first side being positioned to contact said solvent and said second side contacting said coat.
Claim 3
Dependent Claim
23 words
Gas removing apparatus according to claim 1 in which said coat is a film of liquid in which said gas is appreciably soluble.
Claim 4
Dependent Claim
19 words
Gas removing apparatus according to claim 2 in which said film of liquid is a film of light silicone.
Claim 5
Dependent Claim
20 words
Gas removing apparatus according to claim 2 in which said film of liquid is a film of a fluorosilicone liquid.
Claim 6
Dependent Claim
18 words
Gas removing apparatus according to claim 1 in which said coat is a film of solid silicone compound.
Claim 7
Dependent Claim
18 words
Gas removing apparatus according to claim 1 in which said coat is a film of solid fluorosilicone compound.
Claim 8
Dependent Claim
53 words
Gas removing apparatus according to claim 1 in which: said housing further includes a compartment adjacent to the membrane; said chromatographic apparatus further includes pressure means for creating a pressure in said compartment less than the pressure within said tubular flow means, whereby gas is removed from said solvent in said flow means.
Claim 9
Dependent Claim
20 words
Gas removing apparatus according to claim 7 further including pump means for evacuating said compartment to provide the pressure differential.
Claim 10
Dependent Claim
32 words
Gas removing apparatus according to claim 8 in which said membrane adjacent to said compartment is elongated and curved with a large surface area extending over a narrow section of said compartment.
Claim 11
Dependent Claim
21 words
Gas removing apparatus according to claim 9 in which the length of said flow means is large compared to its width.
Claim 12
Dependent Claim
30 words
Gas removing apparatus according to claim 10 in which said membrane is self-supporting and said pump means includes a means for creating a relatively large pressure differential in said cOmpartment.
Claim 13
Dependent Claim
32 words
Gas removing apparatus according to claim 10 in which said membrane is thin and said flow means further includes a porous member between said membrane and said compartment supporting said membrane thereover.
Claim 14
Dependent Claim
23 words
Gas removing apparatus according to claim 10 in which said coat is a film of liquid in which said gas is appreciably soluble.
Claim 15
Dependent Claim
19 words
Gas removing apparatus according to claim 13 in which said film of liquid is a film of light silicone.
Claim 16
Dependent Claim
19 words
Gas removing apparatus according to claim 13 in which said film of liquid is a film of fluorosilicone liquid.
Claim 17
Dependent Claim
18 words
Gas removing apparatus according to claim 10 in which said coat is a film of solid silicone compound.
Claim 18
Dependent Claim
18 words
Gas removing apparatus according to claim 10 in which said coat is a film of solid fluorosilicone compound.
Claim 19
Dependent Claim
30 words
Gas removing apparatus according to claim 1 in which: said housing further includes a compartment adjacent to said membrane; said compartment including means for sorbing said gas in said chamber.
Claim 20
Dependent Claim
17 words
Gas removing apparatus according to claim 18 in which said means for sorbing includes an absorbent material.
Claim 21
Dependent Claim
16 words
Gas removing apparatus according to claim 18 in which said means for sorbing includes adsorbent material.
Claim 22
Dependent Claim
23 words
Gas removing apparatus according to claim 19 in which said coat is a film of liquid in which said gas is appreciably soluble.
Claim 23
Dependent Claim
19 words
Gas removing apparatus according to claim 21 in which said film of liquid is a film of light silicone.
Claim 24
Dependent Claim
19 words
Gas removing apparatus according to claim 21 in which said film of liquid is a film of fluorosilicone liquid.
Claim 25
Dependent Claim
18 words
Gas removing apparatus according to claim 19 in which said coat is a film of solid silicone compound.
Claim 26
Dependent Claim
18 words
Gas removing apparatus according to claim 19 in which said coat is a film of solid fluorosilicone compound.
Claim 27
Dependent Claim
22 words
Gas removing apparatus according to claim 20 in which said coat is a film of liquid in which gas is appreciably soluble.
Claim 28
Dependent Claim
19 words
Gas removing apparatus according to claim 26 in which said film of liquid is a film of light silicone.
Claim 29
Dependent Claim
19 words
Gas removing apparatus according to claim 26 in which said film of liquid is a film of fluorosilicone liquid.
Claim 30
Dependent Claim
18 words
Gas removing apparatus according to claim 20 in which said coat is a film of solid silicone compound.
Claim 31
Dependent Claim
18 words
Gas removing apparatus according to claim 20 in which said coat is a film of solid fluorosilicone compound.
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |