Patent FR1180461A successfully refreshed from Google Patents.
US4581934A
Expired / Lapsed
US
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Method of and apparatus for measurement of the gas loading of a liquid synthetic-resin component
Assignee: Mannesmann Demag Krauss Maffei GmbH
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Filing: 1984-05-14
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Granted: 1986-04-15
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Expires: 2004-05-14
Abstract
Abstract A method of and an apparatus for the measurement of the degree of gas charging of a liquid component of a foam synthetic resin such as a polyurethane. The gas-charged liquid component is introduced into a measuring vessel to a height controlled by an overflow so as to be fixed. The degree of charging is then determined from the measured hydrostatic pressure of each column.
Inventors
- 👤 Emil Holzl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:03
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/44; G01N33/442; B; B29; B29B; B29B7/00; B29B7/30; B29B7/58; B29B7/72; B29B7/726; G01N9/00; G01N9/26; G01N7/00; G01N7/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
128 words
A method of measuring the degree of charging of a liquid synthetic-resin component for the production of a foam synthetic resin with a gas which comprises the steps of: (a) periodically withdrawing samples of a gas-charged liquid synthetic-resin component from a tank containing same under a system pressure; (b) feeding said samples in succession to a measuring vessel constructed and arranged to repetitively and reproducibly establish a liquid column therein of a constant height h for said samples by effecting overflow of said samples above said height; (c) detecting the hydrostatic pressure of said columns; and (d) indicating a parameter representing the degree of gas charging of each of said samples as a function of the hydrostatic pressure p of each of said columns of said height h.
Claim 2
Independent Claim
128 words
A method of measuring the degree of charging of a liquid synthetic-resin component for the production of a foam synthetic resin with a gas which comprises the steps of: (a) periodically withdrawing samples of a gas-charged liquid synthetic-resin component from a tank containing same under a system pressure; (b) feeding said samples in succession to a measuring vessel constructed and arranged to repetitively and reproducibly establish a liquid column therein of a constant height h for said samples by effecting overflow of said samples above said height; (c) detecting the hydrostatic pressure of said columns; and (d) indicating a parameter representing the degree of gas charging of each of said samples as a function of the hydrostatic pressure p of each of said columns of said height h.
Claim 3
Dependent Claim
45 words
The method defined in claim 1, further comprising the step of controlling the charging of said liquid component with said gas by comparing said parameter with a set-point value and regulating the contact of said gas with said liquid component in response to said comparison.
Claim 4
Independent Claim
126 words
An apparatus for measuring the degree of charging of a liquid synthetic-resin component for the production of a foam synthetic resin with a gas, which comprises: an upright measuring vessel provided at an upper location thereof with an overflow for establishing a constant height h of liquid columns of respective liquid samples delivered to said vessel; means for drawing said samples from a tank containing a liquid synthetic-resin charged with gas under a system pressure and introducing said samples into said vessel; a hydrostatic pressure sensor on said vessel responsive to the hydrostatic pressure p of said columns; and means connected to said sensor for indicating a parameter p proportional to the absolute density of said samples and to the degree of charging thereof with gas.
Claim 5
Independent Claim
126 words
An apparatus for measuring the degree of charging of a liquid synthetic-resin component for the production of a foam synthetic resin with a gas, which comprises: an upright measuring vessel provided at an upper location thereof with an overflow for establishing a constant height h of liquid columns of respective liquid samples delivered to said vessel; means for drawing said samples from a tank containing a liquid synthetic-resin charged with gas under a system pressure and introducing said samples into said vessel; a hydrostatic pressure sensor on said vessel responsive to the hydrostatic pressure p of said columns; and means connected to said sensor for indicating a parameter p proportional to the absolute density of said samples and to the degree of charging thereof with gas.
Claim 6
Independent Claim
254 words
An apparatus for measuring the degree of charging of a liquid synthetic-resin component for the production of a foam synthetic resin with a gas, which comprises: an upright measuring vessel provided at an upper location thereof with an overflow for establishing a constant height h of liquid columns of respective liquid samples delivered to said vessel; means for drawing said samples from a tank containing a liquid synthetic-resin charged with gas under a system pressure and introducing said sample into said vessel; a hydrostatic pressure sensor on said vessel responsive to the hydrostatic pressure p of said columns; means connected to said sensor for indicating a parameter proportional to the absolute density of said samples and to the degree of charging thereof with gas; an overflow vessel connected to the overflow of said measuring vessel and receiving overflow of said liquid component therefrom; a piston in said overflow vessel displaceable to vary the effective volume thereof; means for displacing said piston in said overflow vessel; an intake valve connected between said tank and said measuring vessel; a discharge valve connected between said overflow vessel and said tank for returning overflow liquid component to said tank upon advance of said piston; a vent valve communicating with said measuring vessel to apply atmospheric pressure to the contents thereof; and a control unit connected to said valves and to said sensor for the programmed operation of said valves to effect filling and flushing of said measuring vessel in each sample and measurement of the hydrostatic pressure thereof.
Claim 7
Independent Claim
254 words
An apparatus for measuring the degree of charging of a liquid synthetic-resin component for the production of a foam synthetic resin with a gas, which comprises: an upright measuring vessel provided at an upper location thereof with an overflow for establishing a constant height h of liquid columns of respective liquid samples delivered to said vessel; means for drawing said samples from a tank containing a liquid synthetic-resin charged with gas under a system pressure and introducing said sample into said vessel; a hydrostatic pressure sensor on said vessel responsive to the hydrostatic pressure p of said columns; means connected to said sensor for indicating a parameter proportional to the absolute density of said samples and to the degree of charging thereof with gas; an overflow vessel connected to the overflow of said measuring vessel and receiving overflow of said liquid component therefrom; a piston in said overflow vessel displaceable to vary the effective volume thereof; means for displacing said piston in said overflow vessel; an intake valve connected between said tank and said measuring vessel; a discharge valve connected between said overflow vessel and said tank for returning overflow liquid component to said tank upon advance of said piston; a vent valve communicating with said measuring vessel to apply atmospheric pressure to the contents thereof; and a control unit connected to said valves and to said sensor for the programmed operation of said valves to effect filling and flushing of said measuring vessel in each sample and measurement of the hydrostatic pressure thereof.
Claim 8
Dependent Claim
76 words
The apparatus defined in claim 4, further comprising: a pump connected to said tank for delivering said liquid component to a mixing head; a first valve connected between said pump and said mixing head; a gas-charging unit connected to said pump and said tank; second valve connected between said pump and said unit; and means connecting said first and said second valve to said controller for controlling the circulation of said liquid component through said unit.
Claim 9
Dependent Claim
34 words
The apparatus defined in claim 5, further comprising means responsive to said parameter for comparing same with a set-point value to control the degree of charging of said components with gas in said unit.
Claim 10
Dependent Claim
27 words
The apparatus defined in claim 5 wherein means is provided for compensating for the effect on said parameter of fluctuations in atmospheric pressure above said liquid columns.
Claim 11
Dependent Claim
28 words
The apparatus defined in claim 5, further comprising circuit means connected to said sensor for evaluating the hydrostatic pressure detected therein and producing the indication of said parameter.
Claim 12
Dependent Claim
35 words
The apparatus defined in claim 8 wherein said circuit means includes preprogrammed empirical data which is compared with the detected hydrostatic pressure to provide an output representing density or gas content of said liquid component.
Claim 13
Dependent Claim
32 words
The apparatus defined in claim 8 wherein said circuit includes means for calculating said parameter in accordance with a preprogrammed mathematical function representing a physical law relating said parameter to hydrostatic pressure.
Claim 14
Dependent Claim
39 words
The apparatus defined in claim 5, further comprising delay means connected to said venting valve for delaying the opening thereof so that an opposite movement of said piston applies a vacuum to a liquid column in said measuring vessel.
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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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |