US3732736A
Expired / Lapsed
US
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System for adsorption measurement
Assignee: European Atomic Energy Community Euratom
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Filing: 1970-12-04
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Granted: 1973-05-15
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Expires: 1990-12-04
Abstract
Abstract The system measures by the adsorption of gas the specific surfaces of porous or divided solids. It injects equal quantities of adsorbate in stages into a sample-carrying chamber. These equal quantities of adsorbate come from a chamber of constant volume in which, before injection into the sample-carrying chamber, the adsorbate pressure is in each case equal to the pressure of equilibrium of the adsorption of the previous injection increased by a constant value.
Inventors
- 👤 P Glaude
- 👤 W Karcher
- 👤 R Smets
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:48
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01N15/088; G01N15/0893; G01N7/00; G01N7/02; G01N7/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
171 words
Apparatus for measuring the adsorption of a gaseous adsorbate by an adsorbing sample using the static volumetric method of adsorption by successive stages, said apparatus comprising a chamber of constant volume, a sample carrying chamber a first valve connecting the two chambers, an adsorbate pressure controlling means, a second valve connecting the chamber of constant volume to the pressure controlling means, pressure pickup means connected to said chamber of constant volume, and means for connecting a source of adsorbate to said pressure controlling means, the chamber of constant volume serving for the introduction of equal quantities of adsorbate into the sample carrying chamber when said first valve is open whereby the pressure of the two chambers are equilibrates, and after closing said first valve the pressure controlling means permitting the pressure of adsorbate in the chamber of constant volume to rise with a predetermined constant value if said second valve is open, the pressure pick-up means recording the pressure in the chamber of constant volume before and after an adsorbing operation.
Claim 2
Dependent Claim
171 words
Apparatus for measuring the adsorption of a gaseous adsorbate by an adsorbing sample using the static volumetric method of adsorption by successive stages, said apparatus comprising a chamber of constant volume, a sample carrying chamber a first valve connecting the two chambers, an adsorbate pressure controlling means, a second valve connecting the chamber of constant volume to the pressure controlling means, pressure pickup means connected to said chamber of constant volume, and means for connecting a source of adsorbate to said pressure controlling means, the chamber of constant volume serving for the introduction of equal quantities of adsorbate into the sample carrying chamber when said first valve is open whereby the pressure of the two chambers are equilibrates, and after closing said first valve the pressure controlling means permitting the pressure of adsorbate in the chamber of constant volume to rise with a predetermined constant value if said second valve is open, the pressure pick-up means recording the pressure in the chamber of constant volume before and after an adsorbing operation.
Claim 3
Dependent Claim
52 words
Apparatus as claimed in claim 1, wherein the adsorbate pressure controlling means is a manostat operating as a differential pressure regulator, the reference part of which is connected to the sample carrying chamber whereas the regulating part permits the rise of pressure in the chamber of constant volume with said predetermined value.
Claim 4
Dependent Claim
66 words
Apparatus as claimed in claim 2, wherein the regulating part of the manostat communicates by means of a valve with the source of adsorbate and also with a T duct communicating, by means of a valve, with a vacuum pump and by means of a three-way valve, either with the vacuum pump or with the second valve bounding the entry to the chamber of constant volume.
Claim 5
Dependent Claim
20 words
Apparatus as claimed in claim 3, wherein all the ducts forming part of the sample carrying chamber are capillary tubes.
Claim 6
Dependent Claim
36 words
Apparatus as claimed in claim 4 including a calibrated space connected by means of a valve to the chamber of constant volume so as to determine the volume of the two chambers and the capillary tubes.
Claim 7
Dependent Claim
23 words
Apparatus as claimed in claim 5, including two clocks, interconnected for controlling the opening and closing of said first and said second valve.
Claim 8
Dependent Claim
22 words
Apparatus as claimed in claim 6, wherein the calibrated space, the manostat and the sample carrying chamber are made of transparent material.
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |