Patent US4461165A successfully refreshed from Google Patents.
US4461165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for monitoring concentration of gas in a liquid
Assignee: Heineken UK Ltd
•
Filing: 1981-06-22
•
Granted: 1984-07-24
•
Expires: 2001-06-22
Abstract
Abstract A method of and apparatus for monitoring the concentration of gas in a liquid includes a semi-permeable diaphragm across the face of which the liquid flows. Gas contained in the liquid permeates through the diaphragm into a chamber and the pressure within the chamber is measured. This pressure is representative of the concentration of gas in the liquid and permits control of the quantity of gas injected.
Inventors
- 👤 James Kesson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:14
CPC Classifications
G; G01; G01N; G01N7/00; G01N7/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
103 words
A method of controlling the concentration of gas in a liquid comprising: passing said liquid across a semi-permeable membrane in order that gas in the liquid may permeate through the membrane into a measuring chamber, generating a pressure representative electrical signal representative of the pressure of the permeated gas in said chamber, comparing said pressure representative signal with an electrical signal representative of a desired concentration of gas in the liquid to generate a control signal, and using said control signal to control the quantity of said gas injected into the liquid thus to maintain constant the concentration of gas in the liquid.
Claim 2
Independent Claim
103 words
A method of controlling the concentration of gas in a liquid comprising: passing said liquid across a semi-permeable membrane in order that gas in the liquid may permeate through the membrane into a measuring chamber, generating a pressure representative electrical signal representative of the pressure of the permeated gas in said chamber, comparing said pressure representative signal with an electrical signal representative of a desired concentration of gas in the liquid to generate a control signal, and using said control signal to control the quantity of said gas injected into the liquid thus to maintain constant the concentration of gas in the liquid.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1 wherein the measured pressure is corrected for temperature.
Claim 4
Dependent Claim
151 words
Apparatus for controlling the concentration of gas in a liquid, comprising: a housing for fitment to a container or conduit carrying said liquid; a chamber in said housing; a semi-permeable membrane fixed in said housing, one side of said membrane being arranged to be in contact with said liquid and the other side of said membrane forming a wall of said chamber so that gas in said liquid may permeate through said membrane into said chamber; means for generating an electrical pressure representative signal representative of the pressure of said gas within said chamber; means for comparing said pressure representative signal with an electrical signal representative of a desired concentration of said gas in the liquid to generate a control signal; and means responsive to said control signal to control the quantity of said gas injected into the liquid thus to maintain constant the concentration of said gas in the liquid.
Claim 5
Dependent Claim
151 words
Apparatus for controlling the concentration of gas in a liquid, comprising: a housing for fitment to a container or conduit carrying said liquid; a chamber in said housing; a semi-permeable membrane fixed in said housing, one side of said membrane being arranged to be in contact with said liquid and the other side of said membrane forming a wall of said chamber so that gas in said liquid may permeate through said membrane into said chamber; means for generating an electrical pressure representative signal representative of the pressure of said gas within said chamber; means for comparing said pressure representative signal with an electrical signal representative of a desired concentration of said gas in the liquid to generate a control signal; and means responsive to said control signal to control the quantity of said gas injected into the liquid thus to maintain constant the concentration of said gas in the liquid.
Claim 6
Dependent Claim
17 words
Apparatus as claimed in claim 3 wherein said semi-permeable membrane is formed of a silicone rubber diaphragm.
Claim 7
Dependent Claim
17 words
Apparatus as claimed in claim 3 wherein the membrane is supported by a gas porous support member.
Claim 8
Dependent Claim
21 words
Apparatus as claimed in claim 5 wherein the gas porous support member is in the form of a sintered steel disc.
Claim 9
Dependent Claim
17 words
Apparatus as claimed in claim 5 wherein the gas porous support member is formed of wire mesh.
Claim 10
Dependent Claim
33 words
Apparatus as claimed in claim 3 and including solenoid operable valve means on the housing and communicating with the chamber whereby the chamber may be vented to atmosphere, evacuated, or charged with gas.
Claim 11
Dependent Claim
23 words
Apparatus as claimed in claim 3 and including means for measuring the temperature of the liquid and correcting the pressure representative signal accordingly.
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) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |