Patent US4024752A successfully refreshed from Google Patents.
US4024752A
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Method and apparatus for simple field test to determine final boiling point of a volatile liquid sample
Assignee: Mobil Oil AS
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Filing: 1976-07-12
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Granted: 1977-05-24
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Expires: 1996-07-12
Abstract
Abstract An apparatus is provided to directly measure the retention time of a volatile liquid sample in the column of a chromatograph. The apparatus is characterized by a chromatograph having certain resolution, a timer, and a circuit to activate the timer while the sample is eluted from the column. A simple field test to determine the final boiling point of a hydrocarbon fraction such as gasoline is effected by comparing the retention time found for an unknown sample with that of a sample having known final boiling point.
Inventors
- 👤 Matthew R. Orlando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:55
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/02; G01N25/08; G01N30/00; G01N30/02; G01N30/86; G01N30/8624; G01N30/8644; G01N2030/022; G01N2030/025; G01N33/00; G01N33/26; G01N33/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
107 words
An apparatus for measuring the retention time of a volatile liquid sample in a chromatographic column which comprises: (a) a chromatograph of such resolution that the detector output signal exceeds a set point, hereinafter defined, during the elution of at least 98% of said sample from the column; (b) a timer; and (c) means for energizing the timer during the period in which the detector output signal exceeds the set point, said set point being greater than signals resulting from instrument and line noise, and less than the detector output signal during the elution of at least 98% of the sample from the column of the chromatograph.
Claim 2
Independent Claim
107 words
An apparatus for measuring the retention time of a volatile liquid sample in a chromatographic column which comprises: (a) a chromatograph of such resolution that the detector output signal exceeds a set point, hereinafter defined, during the elution of at least 98% of said sample from the column; (b) a timer; and (c) means for energizing the timer during the period in which the detector output signal exceeds the set point, said set point being greater than signals resulting from instrument and line noise, and less than the detector output signal during the elution of at least 98% of the sample from the column of the chromatograph.
Claim 3
Dependent Claim
68 words
The apparatus of claim 1 wherein said chromatograph comprises: (a) a chromatographic column; (b) means for creating a continuous flow of carrier gas through the column; (c) a means for injecting a measured amount of said volatile liquid sample into the flow of carrier gas; (d) means for volatilizing said sample prior to entry into the column; and (e) means for detecting said sample eluted from the column.
Claim 4
Dependent Claim
27 words
The apparatus of claim 2 wherein said column comprises a hollow tube packed with a solid support, the surface of which is coated with a nonvolatile liquid.
Claim 5
Dependent Claim
11 words
The apparatus of claim 2 wherein said carrier gas is helium.
Claim 6
Dependent Claim
16 words
The apparatus of claim 2 further comprising means for maintaining said column at an isothermal temperature.
Claim 7
Dependent Claim
14 words
The apparatus of claim 5 wherein said maintaining means comprise a temperature controlled oven.
Claim 8
Dependent Claim
22 words
The apparatus of claim 5 wherein said isothermal temperature is selected from the range from about 250° F. to about 350° F.
Claim 9
Dependent Claim
14 words
The apparatus of claim 2 wherein said detecting means comprises a thermal conductivity detector.
Claim 10
Dependent Claim
21 words
The apparatus of claim 2 wherein said flow of carrier gas comprises a rate from about 5 to about 10 liters/hour.
Claim 11
Dependent Claim
92 words
The apparatus of claim 2 wherein said injecting means comprise: (a) a housing having therein a cavity and four passages extending from the cavity to the wall of the housing; (b) a lower polymerized tetrafluoro ethylene seat positioned in the cavity; (c) a ball having an aperture therethrough rotatably mounted on the lower polymerized tetrafluoro ethylene seat; (d) a stem connected to said ball; (e) an upper polymerized tetrafluoro ethylene seat; and (f) means to provide contact between the ball and the upper and lower polymerized tetrafluoro ethylene seats to prevent leakage.
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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |