US3633404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmer for chromatographic analyzer
Assignee: Applied Automation Inc
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Filing: 1970-03-12
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Granted: 1972-01-11
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Expires: 1990-03-12
Abstract
Abstract The timing motor which controls a programmer of a chromatographic analyzer is stopped during intervals of the analysis cycle when control operations are not being performed. This permits higher speeds of rotation during the remainder of the cycle, and thereby results in more accurate switching.
Inventors
- 👤 Craig S Chandler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:26
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/88; G01N2030/8804
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
193 words
In an analyzer which includes a chromatographic column, a sample valve connected to the inlet of said column to control the introduction of carrier fluid and sample mixtures into the column, a detector connected to the outlet of said column, a recorder, and an attenuation network connected between said detector and said recorder; means to control the sample valve and attenuation network comprising: a motor; a source of current; means connecting said motor to said source of current to energize said motor; a programmer including a rotatable element, said programmer providing a series of output signals in response to rotation of said element, said rotatable element being connected to said motor so as to be rotated thereby; means responsive to an output signal of said programmer to actuate said sample valve; means responsive to output signals of said programmer to control said attenuation network at predetermined times after said sample valve is actuated; and means responsive to an output signal of said programmer to terminate rotation of said rotatable element for a predetermined time interval at least once after said sample valve has been actuated but prior to completion of an analysis cycle.
Claim 2
Dependent Claim
193 words
In an analyzer which includes a chromatographic column, a sample valve connected to the inlet of said column to control the introduction of carrier fluid and sample mixtures into the column, a detector connected to the outlet of said column, a recorder, and an attenuation network connected between said detector and said recorder; means to control the sample valve and attenuation network comprising: a motor; a source of current; means connecting said motor to said source of current to energize said motor; a programmer including a rotatable element, said programmer providing a series of output signals in response to rotation of said element, said rotatable element being connected to said motor so as to be rotated thereby; means responsive to an output signal of said programmer to actuate said sample valve; means responsive to output signals of said programmer to control said attenuation network at predetermined times after said sample valve is actuated; and means responsive to an output signal of said programmer to terminate rotation of said rotatable element for a predetermined time interval at least once after said sample valve has been actuated but prior to completion of an analysis cycle.
Claim 3
Dependent Claim
57 words
The apparatus of claim 1 wherein said motor is an alternating current synchronous motor, said current source provides alternating current, said means connecting said motor to said current source includes a rectifier and a switch connected in parallel with one another, and said means to terminate rotation comprises means to open said switch for said time interval.
Claim 4
Dependent Claim
60 words
The apparatus of claim 1 wherein said programmer includes a plurality of photocells, said rotatable element comprises a disk having perforations therein, and wherein a light source is positioned on one side of said disk and said photocells are positioned on the other side so that the photocells are illuminated when perforations appear between said light source and said photocells.
Claim 5
Dependent Claim
48 words
The apparatus of claim 1, further comprising an integrator, means connecting the output of said detector to said integrator, a peak detector, means connecting the output of said detector to said peak detector, and means responsive to the output signal of said peak detector to control said integrator.
Claim 6
Dependent Claim
34 words
The apparatus of claim 1 wherein said programmer actuates said means to terminate rotation so that said time interval occurs prior to the time that said means to control said attenuation network is actuated.
Claim 7
Dependent Claim
57 words
The apparatus of claim 4 wherein said means connecting said detector to said peak detector includes a switch actuated by an output signal of said programmer, and wherein said means responsive to said peak detector includes a timer which establishes at least first and second output signals at predetermined spaced time intervals after said timer is actuated.
Claim 8
Dependent Claim
56 words
The apparatus of claim 2 wherein said means to open said switch comprises a timer which is actuated by an output signal of said programmer, said timer being connected to said switch to open said switch at the beginning of said time interval and thereafter to close said switch aT the end of said time interval.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |