Patent US3729981A successfully refreshed from Google Patents.
US3729981A
Expired / Lapsed
US
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Apparatus for determining visual phase equilibria data
Assignee: Cities Service Oil Co
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Filing: 1971-09-17
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Granted: 1973-05-01
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Expires: 1991-09-17
Abstract
Abstract Apparatus is disclosed comprising a capillary tube having piston means contained therein such that the tube may be loaded with a sample system for visual phase equilibria study. Pressure is equalized within and without the capillary tube through movement of the piston for changing volumes required while the temperature remains constant throughout the system.
Inventors
- 👤 G Grady
- 👤 E Swalley
- 👤 S Swift
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:29
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
Apparatus for phase equilibria studies which comprises: a. a capillary tube having one end thereof sealed: b. a slideable piston axially aligned within the capillary tube wherein the piston has a recess milled within its circumferential surface; c. an O-ring mounted within the recess of the piston and snuggly engaging the internal side of the capillary tube; d. a loading cup positioned so as to receive the open end of the capillary tube and retain the capillary tube in a vertical position and further including one or more slots machined therein and having a retaining ring positioned about the sides to hold the capillary tube rigidly in place; and e. a plunger arm connected to the piston and centrally positioned within and affixed to the loading cup and including an outside diameter less than the inside diameter of the capillary tube and extending within the capillary tube so that the piston may rest thereon when the apparatus is not under pressure.
Claim 2
Dependent Claim
161 words
Apparatus for phase equilibria studies which comprises: a. a capillary tube having one end thereof sealed: b. a slideable piston axially aligned within the capillary tube wherein the piston has a recess milled within its circumferential surface; c. an O-ring mounted within the recess of the piston and snuggly engaging the internal side of the capillary tube; d. a loading cup positioned so as to receive the open end of the capillary tube and retain the capillary tube in a vertical position and further including one or more slots machined therein and having a retaining ring positioned about the sides to hold the capillary tube rigidly in place; and e. a plunger arm connected to the piston and centrally positioned within and affixed to the loading cup and including an outside diameter less than the inside diameter of the capillary tube and extending within the capillary tube so that the piston may rest thereon when the apparatus is not under pressure.
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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |