US3562501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Computer control of chromatographs
Assignee: Mobil Oil AS
•
Filing: 1966-06-16
•
Granted: 1971-02-09
•
Expires: 1986-06-16
Abstract
Abstract A digital computer system for controlling and monitoring chromatographic columns including detector means for providing analogue signals representative of the component peaks of the sample streams applied to each chromatographic column, and attenuating means for automatically attenuating the analogue signals in response to signals from the computer. Multiplexing means are provided for sequentially applying the analogue signals of the columns to an analogue to digital converter which, in turn, applies the digital signals to the digital computer. The system also includes means for generating a weighted slope to smooth out noise.
Inventors
- 👤 Francis C Mears
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:58
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/86; G01N30/8624; G01N30/8641; G01N30/04; G01N30/24; G01N30/88; G01N2030/8804; G01N2030/8881; G01N30/26; G01N30/38; G01N30/46; G01N30/466
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
180 words
An apparatus comprising: at least two chromatographs, each of said chromatographs having a sample injection means and a detector means which provides an analogue output signal representative of the passage of components through the respective chromatographs; a digital computer means which provides a signal to actuate said sample injection means to admit stream samples to said chromatographs, and which includes program means for causing said digital computer means to periodically sample the output signals from each of said chromatographs, to store signals representative of the amplitudes of successive sample signals from each of said chromatographs, and to generate a smoothed slope for each output signal from said chromatographs in accordance with: Sn aSn-1 + b(xn - Xn-y), where Sn current smoothed slope, Sn-1 preceding smoothed slope, Xn current amplitude signal, Xn-y a preceding amplitude signal separated in succession by y, where y>1, and a and b weighting factors, a>b thereby indicating the weighted slopes of the output signals from said chromatographs; and an analogue to digital converter which is operatively connected between said detector means and said digital computer means.
Claim 2
Independent Claim
180 words
An apparatus comprising: at least two chromatographs, each of said chromatographs having a sample injection means and a detector means which provides an analogue output signal representative of the passage of components through the respective chromatographs; a digital computer means which provides a signal to actuate said sample injection means to admit stream samples to said chromatographs, and which includes program means for causing said digital computer means to periodically sample the output signals from each of said chromatographs, to store signals representative of the amplitudes of successive sample signals from each of said chromatographs, and to generate a smoothed slope for each output signal from said chromatographs in accordance with: Sn aSn-1 + b(xn - Xn-y), where Sn current smoothed slope, Sn-1 preceding smoothed slope, Xn current amplitude signal, Xn-y a preceding amplitude signal separated in succession by y, where y>1, and a and b weighting factors, a>b thereby indicating the weighted slopes of the output signals from said chromatographs; and an analogue to digital converter which is operatively connected between said detector means and said digital computer means.
Claim 3
Dependent Claim
25 words
The apparatus of claim 1 comprising means to vary the magnitude of said output signal in response to the passage of components through the chromatographs.
Claim 4
Dependent Claim
41 words
The apparatus of claim 1 wherein said digital computer means comprises program means for causing said digital computer means to integrate the signals from the respective detector means and to generate a signal representative of the components in each sample stream.
Claim 5
Dependent Claim
25 words
The apparatus of claim 3 comprising means to alternatively transmit said analogue output signals from each respective detector means to said analogue to digital converter.
Claim 6
Dependent Claim
23 words
The apparatus of claim 1 comprising means to automatically attenuate said analogue output signal in response to a signal from said digital computer.
Claim 7
Dependent Claim
30 words
The apparatus of claim 5 wherein said means to attenuate the analogue signal comprises a series of relays which respectively actuate switches to incorporate attenuator resistors in said output signal.
Claim 8
Dependent Claim
17 words
The apparatus of claim 1 comprising multiplexing means operatively connected between said computer means and said chromatographs.
Claim 9
Independent Claim
121 words
An apparatus comprising at least two chromatographs each of said chromatographs having a sample injection means and a detector means which provides an analogue output signal representative of the passage of components through the respective chromatographs, a digital computer means which provides a signal to actuate said sample injection means to admit stream samples to said chromatographs, an analogue to digital converter which has an operating range and which is operatively connected between said detector means and said digital coMputer means, and means operatively connected between said detector means and said converter for automatically attenuating said analogue signal in response to an attenuation signal from said digital computer means whenever said analogue signal exceeds a predetermined percentage of said operating range.
Claim 10
Independent Claim
121 words
An apparatus comprising at least two chromatographs each of said chromatographs having a sample injection means and a detector means which provides an analogue output signal representative of the passage of components through the respective chromatographs, a digital computer means which provides a signal to actuate said sample injection means to admit stream samples to said chromatographs, an analogue to digital converter which has an operating range and which is operatively connected between said detector means and said digital coMputer means, and means operatively connected between said detector means and said converter for automatically attenuating said analogue signal in response to an attenuation signal from said digital computer means whenever said analogue signal exceeds a predetermined percentage of said operating range.
Claim 11
Dependent Claim
18 words
The apparatus of claim 8 comprising multiplexing means operatively connected between said digital computer means and said chromatographs.
Claim 12
Dependent Claim
108 words
The apparatus of claim 9 which comprises: program means for causing said digital computer means to periodically sample the output signals from each of said chromatographs, to store signals representative of the amplitudes of successive sample signals from each of said chromatographs, and to generate a smoothed slope for each output signal from said chromatographs in accordance with: Sn aSn-1 + b(Xn - Xn-y), where Sn current smoothed slope, Sn-1 preceding smoothed slope, Xn current amplitude signal, Xn-y a preceding amplitude signal separated in succession by y, where y>1, and a and b weighting factors, a>b thereby indicating the weighted slopes of the output signals from said chromatographs.
Claim 13
Dependent Claim
42 words
The apparatus of claim 8 wherein said digital computer means comprises programming means for causing said digital computer means to integrate the signals from the respective detector means and means to generate a signal representative of the components in each stream sample.
Claim 14
Dependent Claim
25 words
The apparatus of claim 11 comprising means to alternatively transmit said analogue output signals from each respective detector means to said analogue to digital converter.
Claim 15
Dependent Claim
21 words
The apparatus of claim 8 wherein said attenuating means attenuates said analogue signal by a binary factor 1 , where n>0.
Claim 16
Independent Claim
106 words
An apparatus comprising at least two chromatographs each of said chromatographs having a sample injection means and a detector means which provides an analogue output signal representative of the passage of components through the respective chromatographs, a digital computer means which provides a signal to actuate said sample injection means to admit stream samples to said chromatographs, an analogue to digital converter which is operatively connected between said detector means and said digital computer means and means responsive to an attenuation signal from said digital computer means for attenuating said analogue signal by a binary factor prior to application of said binary signal to said converter.
Claim 17
Independent Claim
106 words
An apparatus comprising at least two chromatographs each of said chromatographs having a sample injection means and a detector means which provides an analogue output signal representative of the passage of components through the respective chromatographs, a digital computer means which provides a signal to actuate said sample injection means to admit stream samples to said chromatographs, an analogue to digital converter which is operatively connected between said detector means and said digital computer means and means responsive to an attenuation signal from said digital computer means for attenuating said analogue signal by a binary factor prior to application of said binary signal to said converter.
Claim 18
Dependent Claim
101 words
In a method of processing output signals from a plurality of chromatographs in a digital computer the steps comprising: generating signals by said computer for controlling application of sample streams to said chromatographs; generating an analogue signal representative of the passage of components through each of said chromatographs; attenuating each of said analogue signals by a binary factor 1 , where n>0, when said analogue signals reach a predetermined amplitude; converting said attenuated analogue signals to a binary signal; applying said binary signal to a digital computer; and processing said binary signal within said computer in accordance with a predetermined algorithm.
Claim 19
Dependent Claim
101 words
In a method of processing output signals from a plurality of chromatographs in a digital computer the steps comprising: generating signals by said computer for controlling application of sample streams to said chromatographs; generating an analogue signal representative of the passage of components through each of said chromatographs; attenuating each of said analogue signals by a binary factor 1 , where n>0, when said analogue signals reach a predetermined amplitude; converting said attenuated analogue signals to a binary signal; applying said binary signal to a digital computer; and processing said binary signal within said computer in accordance with a predetermined algorithm.
Claim 20
Dependent Claim
106 words
The method of claim 15 wherein the processing step includes causing said computer to periodically sample the output signals from each of said chromatographs, to store signals representative of the amplitudes of successive sample signals from each of said chromatographs, and to generate a smoothed slope for each output signal from said chromatographs in accordance with: Sn aSn-1 + b(Xn - Xn-y), where Sn current smoothed slope, Sn-1 preceding smoothed slope, Xn current amplitude signal, Xn-y a preceding amplitude signal separated in succession by y, where y>1, and a and b weighting factors, a>b, to thereby indicate weighted slopes of the signals from said chromatographs. 0415
References Cited (Backward Citations)
US3049908A
Cited
US3284616A
Cited
US3185820A
Cited
US3328774A
Cited
US3333090A
Cited
US3385960A
Cited
US3375701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |