Patent US3639741A successfully refreshed from Google Patents.
US3639741A
Expired / Lapsed
US
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Automatic high-resolution mass measurement
Assignee: NAT RES DEV
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Filing: 1969-07-25
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Granted: 1972-02-01
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Expires: 1989-07-25
Abstract
Abstract A hybrid analogue-digital analyzer for the online digitization of electrically recorded mass spectra. The device, which does not incorporate a digital computer, accurately selects peak maxima to provide triggering pulses for timing circuitry, and uses directly controlled buffer storage to reduce the effective rate of data acquisition to that of the average speed of the associated output channel. The analyzer is primarily intended to provide records of complete high resolution mass spectra suitable for off-line computer processing. For real time production of reduced and annotated spectra the analyzer may be used as an active interface directly coupled to a computer.
Inventors
- 👤 Alan Carrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:10
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/153; H03K5/1532; H01; H01J; H01J49/00; H01J49/02; H01J49/022
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
A mass spectrum analyzer comprising analogue means operative to detect the maximum of each peak of a spectrometer output signal and therefrom provide only control signals coincident with each peaK maximum to define the positions of the peak maxima in time, signal generating means providing successive scan timeindicating signals, an output interface, director means connected to receive said control signals and operative to direct the simultaneously available scan time signals from said generating means to said output interface, and means operative to measure the amplitude of the spectral peaks and means for providing at said output interface signals interface signals indicative of the intensity of each peak maximum.
Claim 2
Dependent Claim
108 words
A mass spectrum analyzer comprising analogue means operative to detect the maximum of each peak of a spectrometer output signal and therefrom provide only control signals coincident with each peaK maximum to define the positions of the peak maxima in time, signal generating means providing successive scan timeindicating signals, an output interface, director means connected to receive said control signals and operative to direct the simultaneously available scan time signals from said generating means to said output interface, and means operative to measure the amplitude of the spectral peaks and means for providing at said output interface signals interface signals indicative of the intensity of each peak maximum.
Claim 3
Dependent Claim
60 words
A mass spectrum analyzer as claimed in claim 1, which includes buffer storage means into which said selected scan time signals are initially directed under the control of said director means, and encoder means at the output side of said buffer storage means for converting the signalled scan time signals into a form suitable for application to said output interface.
Claim 4
Dependent Claim
70 words
A mass spectrum analyzer as claimed in claim 2, wherein said buffer storage means comprises a plurality of registers which are sequentially available to receive the scan time signals and are each connected to said director means to control the accessibility thereof, and multiplexer and serializer means connected to the outputs of said registers and effective to read out data to said encoder means at an appropriate rate and time.
Claim 5
Dependent Claim
49 words
A mass spectrum analyzer as claimed in claim 1, wherein said analogue means comprises a differentiating circuit providing the waveform derivative of the spectral signals, and a trigger circuit operative to provide a pulsed control signal in response to the cutting of a datum level by the differentiated waveform.
Claim 6
Dependent Claim
33 words
A mass spectrum analyzer as claimed in claim 4, wherein said analogue means includes a logarithmic amplifier connected to receive the spectrometer output signal and to provide the input to said differentiating circuit.
Claim 7
Dependent Claim
69 words
A mass spectrum analyzer as claimed in claim 1, wherein said signal generating means comprises a clock pulse generator and a counter arranged to provide on each of a plurality of output lines a series of progressively increasing multidigit parallel-mode bits indicative respectively of the total number of unit time intervals between successive pulses from the clock pulse generator and the instant of commencement of each spectrometer scan cycle.
Claim 8
Dependent Claim
24 words
A mass spectrum analyzer as claimed in claim 1, wherein said amplitude measuring means comprises a multilevel peak height-sensing device connected to a counter.
Claim 9
Dependent Claim
20 words
A mass spectrum analyzer as claimed in claim 1, wherein said amplitude measuring means comprises an analogue to digital converter.
Claim 10
Dependent Claim
20 words
A mass spectrum analyzer as claimed in claim 1, wherein the output interface is connected to a paper tape punch.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |