US3832062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrophotometrical apparatus for determining dosing substances in a liquid
Assignee: DEN BOSCH F VAN
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Filing: 1973-03-27
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Granted: 1974-08-27
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Expires: 1993-03-27
Abstract
Abstract Spectrophotometric apparatus for determining substances present in a liquid by a visual indication or display of the differences between a spectrum of the liquid and a standard liquid. A spectrum of the liquid and a reference liquid is analyzed by scanning the band-width of luminous radiation from the ultraviolet to the near infra-red. The spectra are alternatively chopped and compared with a reference voltage. The output representing the difference between the spectra is obtained from an operational amplifier having a feedback circuit including a light generating element for generating a light output proportional to the difference between the spectral and a light sensitive element responsive to the light output of the light generating means. Alternatively the apparatus may be used to compare a previously made recording with a standard recording so that the differences therebetween can be displayed for immediate analysis as an aid in the diagnoses of blood, etc.
Inventors
- 👤 Den Bosch F Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:57
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/42; G01J1/00; G01J1/10; G01J1/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
191 words
Spectrophotometric apparatus for determining substances present in a liquid, comprising: means for emitting luminous radiation in a range from ultraviolet to near infra-red; a monochromator including a grating providing a variable slit width for determining the bandwidth of said luminous radiation; means for focusing said luminous radiation onto the grating of said monochromator; means for exposing the liquid to be examined to said radiation and exposing a known liquid to said radiation for respectively generating first and secOnd spectrums; means for sweeping the spectrum of said luminous radiation by varying the grating of said monochromator; means for alternatively chopping said first and second spectrums; means for analyzing said chopped first and second spectrums to determine the difference therebetween and including an operational amplifier for alternately amplifying said first and second spectrums, said operational amplifier including a feedback circuit with a light generating element for generating a light output proportional to the difference between said first and second spectrums and a light sensitive element responsive to the light output of said light generating means for controlling the resistance of said feedback circuit; and means for recording the output of said operational amplifier.
Claim 2
Dependent Claim
191 words
Spectrophotometric apparatus for determining substances present in a liquid, comprising: means for emitting luminous radiation in a range from ultraviolet to near infra-red; a monochromator including a grating providing a variable slit width for determining the bandwidth of said luminous radiation; means for focusing said luminous radiation onto the grating of said monochromator; means for exposing the liquid to be examined to said radiation and exposing a known liquid to said radiation for respectively generating first and secOnd spectrums; means for sweeping the spectrum of said luminous radiation by varying the grating of said monochromator; means for alternatively chopping said first and second spectrums; means for analyzing said chopped first and second spectrums to determine the difference therebetween and including an operational amplifier for alternately amplifying said first and second spectrums, said operational amplifier including a feedback circuit with a light generating element for generating a light output proportional to the difference between said first and second spectrums and a light sensitive element responsive to the light output of said light generating means for controlling the resistance of said feedback circuit; and means for recording the output of said operational amplifier.
Claim 3
Dependent Claim
56 words
Spectrophotometric apparatus as in claim 1 wherein said means for analyzing further includes first and second inputs, means for switching the input of said operational amplifier to either said first or second input, and means for generating synchronizing pulses to control the switching of said first and second inputs and the operation of said operational amplifier.
Claim 4
Dependent Claim
42 words
Spectrophotometric apparatus as in claim 2 wherein said means for analyzing further includes means for comparing the output of said operational amplifier with a reference voltage and said means for generating light is responsive to the output of said means for comparing.
Claim 5
Dependent Claim
50 words
Spectrophotometric apparatus as in claim 3 wherein said means for switching includes an inverter for generating the ratio of the first input to the second input and the ratio of the second input to the first input and means for switching either of said ratios to said means for comparing.
Claim 6
Dependent Claim
48 words
Spectrophotometric apparatus as in claim 4 wherein said means for switching comprises a pair of symmetrically connected field-effect transistors each having inputs respectively responsive to the input and output of said inverter whereby said first and second inputs are alternatively applied to the input of said operational amplifier.
Claim 7
Dependent Claim
45 words
Spectrophotometric apparatus as in claim 5 wherein said means for comparing includes a symmetrical amplifier and a logic circuit responsive to the output of said symmetrical amplifier and the input and output of said inverter for determining the difference between said first and second inputs.
Claim 8
Dependent Claim
50 words
Spectrophotometric apparatus as in claim 2 wherein said first input receives electrical signals representing recorded output of said operational amplifier and said second input receives electrical signals representing the composition of a known liquid, whereby the output of said operational amplifier indicates the difference between said first and second inputs.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |