US3923399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniaturized spectrophotometer
Assignee: Milton Roy LLC
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Filing: 1974-04-25
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Granted: 1975-12-02
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Expires: 1994-04-25
Abstract
Abstract The miniaturized spectrophotometer is compact, lightweight, ruggedly constructed for adaptive analytical study of liquid samples for use both in the field and in a laboratory. The spectrophotometer includes a readily replaceable light source for transmitting radiant flux along a light path in a self-contained monochromator. A mirror receiving the radiant flux reflects it along a light path disposed at a relatively small angle to the light path between the mirror and the light source. A diffraction grating disposed for receiving the light reflected from the mirror is pivotally controlled by a fixed-length nonadjustable sine bar. A sine bar control provides for selecting the wavelengths to pass through a sample compartment exit slit as a very narrow band width of radiation. The sample compartment assembly is removable from the main assembly of the spectrophotometer and is adaptable to accommodate multishaped sample containers. Electronic circuitry specific to the type of analytical study under consideration is encapsulated in the removable sample compartment. The main assembly of the spectrophotometer includes a replaceable battery power pack and electrical circuitry for generally providing digital or meter readout of the analytical transmittance and absorbance values of tested samples.
Inventors
- 👤 Corwin H Brumley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:09
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/42
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
177 words
A miniaturized spectrophotometer used in analyzing a liquid sample, comprising: a main assembly housing having an exteriorly accessible locking screw knob for attaching and detaching a separate liquid sample compartment housing; a monochromator carried within said main housing including a light source and a diffraction grating for emitting monochromatic electromagnetic flux at selective wavelengths; a separate liquid sample compartment housing detachably connected by the locking screw knob to said main housing for receiving the monochromatic flux used in analyzing a liquid sample; a separate removable liquid sample container disposed within said sample compartment housing for carrying a liquid sample and receiving the monochromatic flux; a photosensor and an amplifier circuit carried within said sample compartment housing for receiving attenuated flux and generating an output signal as a function of the attenuated flux; meter means carried within said main housing and detachably electrically connected to the amplifier circuit for providing a readout as a function of the output signal; and a rechargeable battery power pack carried within said main housing for energizing the light source and amplifier circuit.
Claim 2
Dependent Claim
177 words
A miniaturized spectrophotometer used in analyzing a liquid sample, comprising: a main assembly housing having an exteriorly accessible locking screw knob for attaching and detaching a separate liquid sample compartment housing; a monochromator carried within said main housing including a light source and a diffraction grating for emitting monochromatic electromagnetic flux at selective wavelengths; a separate liquid sample compartment housing detachably connected by the locking screw knob to said main housing for receiving the monochromatic flux used in analyzing a liquid sample; a separate removable liquid sample container disposed within said sample compartment housing for carrying a liquid sample and receiving the monochromatic flux; a photosensor and an amplifier circuit carried within said sample compartment housing for receiving attenuated flux and generating an output signal as a function of the attenuated flux; meter means carried within said main housing and detachably electrically connected to the amplifier circuit for providing a readout as a function of the output signal; and a rechargeable battery power pack carried within said main housing for energizing the light source and amplifier circuit.
Claim 3
Dependent Claim
15 words
The spectrophotometer as defined in claim 1, wherein the light source comprises a prefocused lamp.
Claim 4
Dependent Claim
41 words
The spectrophotometer as defined in claim 2, wherein the prefocused lamp is mechanically and electrically connected to a lamp housing board insertable into the main assembly housing to axially extend before a light entrance slit defined by the main assembly housing.
Claim 5
Dependent Claim
42 words
The spectrophotometer as defined in claim 1, wherein the diffraction grating for emitting monochromatic electromagnetic flux at selective wavelengths is pivotally controlled by a manual control including a nonadjustable sine bar extending between a sine bar control nut and the diffraction grating.
Claim 6
Dependent Claim
40 words
The spectrophotometer as defined in claim 1, wherein the separate removable liquid sample container comprises a sample compartment cell providing a long path for the liquid sample for attenuating the electromagnetic flux passing through a liquid sample in the cell.
Claim 7
Dependent Claim
30 words
The spectrophotometer as defined in claim 1, wherein the monochromator further includes a substantially yellow filter and a substantially blue filter to eliminate higher order wavelengths and stray light, respectively.
Claim 8
Dependent Claim
43 words
The spectrophotometer as defined in claim 1, wherein the means for providing a meter readout includes a meter having a scale incremented to provide a readout as a function of the received output signal and the attenuated flux passing through the liquid sample.
Claim 9
Dependent Claim
42 words
The spectrophotometer as defined in claim 1, wherein the means for providing a meter readout includes a digital meter for providing a digital display readout as a function of the received output signal and the attenuated flux passing through the liquid sample.
Claim 10
Dependent Claim
27 words
The spectrophotometer as defined in claim 1, wherein the main assembly housing includes a mounting means compatible to receive a fixture for secure mounting of the spectrophotometer.
Claim 11
Dependent Claim
28 words
The spectrophotometer as defined in claim 1, further including a light source control for controlling the intensity of the light source as a function of the selective wavelengths.
Claim 12
Dependent Claim
216 words
A miniaturized spectrophotometer for analyzing a liquid sample, comprising: a main assembly housing; a monochromator carried within said main housing for emitting monochromatic electromagnetic flux at selected wavelengths, including a light source for emitting the electromagnetic flux, a light source control for controlling the intensity of the light source as a function of the selected wavelengths, a pivotally controlled diffraction grating having a nonadjustable sine bar extending between a sine bar control nut and the diffraction grating, and a substantially yellow filter and a substantially blue filter to eliminate higher order wavelengths and stray light; a separate liquid sample compartment housing detachably connected to said main housing for receiving the monochromatic flux used in analyzing a liquid sample; a separate removable liquid sample container disposed within said sample compartment housing for, carrying a liquid sample and receiving the monochromatic flux; a photosensor and an amplifier circuit carried within said sample compartment housing for receiving attenuated flux and generating an output signal as a function of the attenuated flux; meter means carried within said main housing and detachably electrically connected to the amplifier circuit for providing a digital readout as a function of the amplifier circuit output carried; and a rechargeable battery power pack carried within said main housing for energizing the light source and amplifier circuit.
Claim 13
Dependent Claim
216 words
A miniaturized spectrophotometer for analyzing a liquid sample, comprising: a main assembly housing; a monochromator carried within said main housing for emitting monochromatic electromagnetic flux at selected wavelengths, including a light source for emitting the electromagnetic flux, a light source control for controlling the intensity of the light source as a function of the selected wavelengths, a pivotally controlled diffraction grating having a nonadjustable sine bar extending between a sine bar control nut and the diffraction grating, and a substantially yellow filter and a substantially blue filter to eliminate higher order wavelengths and stray light; a separate liquid sample compartment housing detachably connected to said main housing for receiving the monochromatic flux used in analyzing a liquid sample; a separate removable liquid sample container disposed within said sample compartment housing for, carrying a liquid sample and receiving the monochromatic flux; a photosensor and an amplifier circuit carried within said sample compartment housing for receiving attenuated flux and generating an output signal as a function of the attenuated flux; meter means carried within said main housing and detachably electrically connected to the amplifier circuit for providing a digital readout as a function of the amplifier circuit output carried; and a rechargeable battery power pack carried within said main housing for energizing the light source and amplifier circuit.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |