US3728899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure gauge
Assignee: Heineken Brouwerijen NV
•
Filing: 1972-02-17
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Granted: 1973-04-24
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Expires: 1992-02-17
Abstract
Abstract In a pressure gauge of the Bourdon type wherein the gas pressure to be measured is compared with a reference pressure, the reference pressure being provided by a saturated vapor pressure, which liquid shows at least substantially the same characteristic under the influence of temperature and atmospheric pressure variations as the gas to be gauged.
Inventors
- 👤 L Dijkema
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:27
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/02; G01L7/04; G01L19/00; G01L19/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
A pressure gauge for gauging the equilibrium pressure of carbon dioxide dissolved in a liquid comprising a housing containing an element loadable on one side by the carbon dioxide pressure and on the other side by a reference pressure and deforming under the pressure differential, said housing containing an atmosphere of the saturated vapor of a reference liquid to produce said reference pressure on said other side of the deformable element, the vapor pressure of said reference liquid under the influence of temperature variations showing substantially the same characteristic as the equilibrium pressure of carbon dioxide dissolved in the first said liquid.
Claim 2
Dependent Claim
102 words
A pressure gauge for gauging the equilibrium pressure of carbon dioxide dissolved in a liquid comprising a housing containing an element loadable on one side by the carbon dioxide pressure and on the other side by a reference pressure and deforming under the pressure differential, said housing containing an atmosphere of the saturated vapor of a reference liquid to produce said reference pressure on said other side of the deformable element, the vapor pressure of said reference liquid under the influence of temperature variations showing substantially the same characteristic as the equilibrium pressure of carbon dioxide dissolved in the first said liquid.
Claim 3
Dependent Claim
31 words
A pressure gauge according to claim 1 arranged for gauging the equilibrium pressure of carbon dioxide in beer at a temperature between -1* and +4*C wherein the reference liquid is n-butane.
Claim 4
Dependent Claim
31 words
A pressure gauge according to claim 1 arranged for gauging the equilibrium pressure of carbon dioxide in lemonade at a temperature of 8* - 10*C wherein the reference liquid is dimethylamine.
Claim 5
Dependent Claim
49 words
A pressure gauge according to claim 1 wherein the space on the side of the deformable element loadable by the reference pressure is partly filled with said reference liquid, and said pressure gauging device is kept in heat-exchanging contact with the liquid in which the carbon dioxide is dissolved.
Claim 6
Dependent Claim
45 words
A pressure gauge according to claim 1 wherein the pressure gauge is a Bourdon gauge and at least one wall of the housing is provided with elements for promoting heat exchange between reference liquid present in the housing and the liquid containing the carbon dioxide.
Claim 7
Dependent Claim
53 words
A pressure gauge according to claim 1 wherein the pressure gauge is a Bourdon gauge, said housing is solely filled with the saturated vapor of the reference liquid and is connected via a pressure conduit to a reservoir containing the reference liquid, said reservoir being immersible in the liquid containing the carbon dioxide.
References Cited (Backward Citations)
US3267734A
Cited
US3370470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |