US4272983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for porosimetric measurements
Assignee: Fisons Instruments SpA
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Filing: 1979-10-31
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Granted: 1981-06-16
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Expires: 1999-10-31
Abstract
Abstract An apparatus for porosimetric measurements, wherein a sample to be analyzed is put in an ampoule filled with mercury and submitted to ever increasing pressures, in order to obtain measurements of the mercury volume variations due to pressure increases. Such mercury volume variations, which are correlated to the sample pore sizes, are detected by measuring capacity variations in a mercury condenser provided for in a capillary neck of ampoule.
Inventors
- 👤 Giorgio Sisti
- 👤 Ermete Riva
- 👤 Pietro Italiano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:32
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01N15/088; G01N15/0886
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
142 words
Apparatus for porosimetric measurements comprising a vessel for housing a solid to be analysed, said solid being immersed in mercury and suitable for being subjected to controlled pressure increases, said vessel including a neck portion taking the form of a gauged-diameter capillary where a mercury meniscus forms at any pressure condition during the measurement, said gauged-diameter capillary being formed of dielectric material and having walls exhibiting a gauged thickness, armature means formed of electrically conductive material externally surrounding said neck, means for electrically communicating through said vessel with mercury present therein, and means for connecting said armature means outside zones subjected to pressure and said electrically communicating means in a circuit including a power source and means for measuring capacity variations of a mercury condenser formed in said capillary between said mercury and said armature and the dielectric wall of said capillary.
Claim 2
Dependent Claim
142 words
Apparatus for porosimetric measurements comprising a vessel for housing a solid to be analysed, said solid being immersed in mercury and suitable for being subjected to controlled pressure increases, said vessel including a neck portion taking the form of a gauged-diameter capillary where a mercury meniscus forms at any pressure condition during the measurement, said gauged-diameter capillary being formed of dielectric material and having walls exhibiting a gauged thickness, armature means formed of electrically conductive material externally surrounding said neck, means for electrically communicating through said vessel with mercury present therein, and means for connecting said armature means outside zones subjected to pressure and said electrically communicating means in a circuit including a power source and means for measuring capacity variations of a mercury condenser formed in said capillary between said mercury and said armature and the dielectric wall of said capillary.
Claim 3
Dependent Claim
58 words
The apparatus according to claim 1 wherein said vessel takes the form of a glass ampoule housed in an autoclave and said autoclave is filled with a liquid, partly penetrating into said neck of said vessel which may be subjected to controlled increases in pressure, said liquid manifesting constant dielectric properties at any pressure condition during measuring operations.
Claim 4
Dependent Claim
15 words
The apparatus according to claim 2, wherein said liquid is a dielectric oil for transformers.
Claim 5
Dependent Claim
18 words
The apparatus according to claim 1, wherein said capillary is made of a glass stable at any temperature.
Claim 6
Dependent Claim
29 words
The apparatus according to claim 4, wherein said armature means is externally covered by a layer made of antifriction material to facilitate positioning of said capillary in said autoclave.
Claim 7
Dependent Claim
49 words
The apparatus according to claim 1, wherein said electrical power source takes the form of a square-wave oscillator and said mercury condenser results in a circuit supplied by said square-wave oscillator and a diode pump formed by a plurality of diodes and operating at fixed frequency and variable capacity.
Claim 8
Dependent Claim
42 words
The apparatus according to claim 6, wherein said means for measuring comprises said diode pump, an integration condenser, a negative feedback amplifier and terminal means at which a difference of potential proportional to the capacity of said mercury condenser may be recorded.
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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |