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Patent US3797300A successfully refreshed from Google Patents.
US3797300A
Expired / Lapsed
US
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Automatic base line drift corrector device for use in an integrator for chromatographical analysis
Assignee: Shimadzu Corp
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Filing: 1971-11-23
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Granted: 1974-03-19
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Expires: 1991-11-23
Abstract
Abstract An automatic base line drift corrector device for use in an integrator for chromatographical analysis, essentially including means for generating an instantaneous correction signal by which a correcting operation with respect to the base line value of the signal can be instantaneously carried out and means for generating a non-instantaneous correction signal by which a correcting operation with respect to the base line value of the signal can be carried out with a time lag with respect to the detected signal, either of said first and second generating means being employed by a switching means for excluding an interval between the starting and terminating points of the peak appearing in the signal in connection with the wave form or time of the signal.
Inventors
- 👤 T Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:02
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/86; G01N30/8603; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; G06G7/186
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
253 words
An automatic base line drift corrector device for use in an integrator for chromatographical analysis, comprising: a. means for receiving a signal from a measuring instrument; b. peak detecting means coupled to said signal receiving means for detecting the start and end time points of a peak appearing in said signal; c. correction signal generating means coupled to said signal receiving means and said peak detecting means for generating a correction signal by which the base line value of the signal can be carried out; d. first switching means coupled to said correction signal generating means and said peak detecting means for switching said correction signal generating means off between the start and end time points of a peak in said signal; e. instantaneous correction signal means coupled to said correction signal generating means for causing instantaneous generation of a correction signal; f. time delay correction signal means coupled to said correction signal generating means for causing generation of a correction signal after a predetermined time delay; g. further switching means coupled to said instantaneous correction on signal means and said time delay correction signal means for switching from one to the other for causing said correction signal generating means to generate a correction signal instantaneously or with a time delay at the end time point of a peak appearing in said signal; and h. integrating means coupled to said correction signal generating means and said peak detecting means for integrating the area under a peak in the wave form of the signal.
Claim 2
Dependent Claim
253 words
An automatic base line drift corrector device for use in an integrator for chromatographical analysis, comprising: a. means for receiving a signal from a measuring instrument; b. peak detecting means coupled to said signal receiving means for detecting the start and end time points of a peak appearing in said signal; c. correction signal generating means coupled to said signal receiving means and said peak detecting means for generating a correction signal by which the base line value of the signal can be carried out; d. first switching means coupled to said correction signal generating means and said peak detecting means for switching said correction signal generating means off between the start and end time points of a peak in said signal; e. instantaneous correction signal means coupled to said correction signal generating means for causing instantaneous generation of a correction signal; f. time delay correction signal means coupled to said correction signal generating means for causing generation of a correction signal after a predetermined time delay; g. further switching means coupled to said instantaneous correction on signal means and said time delay correction signal means for switching from one to the other for causing said correction signal generating means to generate a correction signal instantaneously or with a time delay at the end time point of a peak appearing in said signal; and h. integrating means coupled to said correction signal generating means and said peak detecting means for integrating the area under a peak in the wave form of the signal.
Claim 3
Dependent Claim
78 words
An automatic base line drift corrector device as claimed in claim 1, in which said further switching means includes delay means for delaying the operation of said further switching means for a certain period and after said certain period, said further switching means switches said instantaneous correction signal means when the start time point has been detected by said peak detecting means and switches said time delay correction signal means when no start time point has been detected.
Claim 4
Dependent Claim
23 words
An automatic base line drift corrector device as claimed in claim 2 wherein said delaying means is operable to vary the certain period.
Claim 5
Dependent Claim
64 words
An automatic base line drift corrector device as claimed in claim 1 wherein said further switching means comprises discriminating means for detecting the polarity of the wave form of the signal and for switching said instantaneous correction signal means when the discriminating means detects a negative polarity and for switching said time delay correction signal means when the discriminating means detects a positive polarity.
Claim 6
Dependent Claim
32 words
An automatic base line drift corrector device as claimed in claim 4 wherein said discriminating means is operable when fluctuations in the signal are much larger than a predetermined value of drift.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |