Patent US4412374A successfully refreshed from Google Patents.
US4241998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrophotometer
Assignee: Hoffmann La Roche Inc
•
Filing: 1979-01-18
•
Granted: 1980-12-30
•
Expires: 1999-01-18
Abstract
Abstract Spectrophotometer intended in particular for the optical analysis of samples in a rotatory analyser. In order to attain the characteristics required of a modern spectrophotometer for clinical chemistry and to attain in particular a high reproducibility of the measurements, the spectrophotometer comprises a flash tube, an stabilizing optical device for device for deriving a light beam having a constant spatial distribution from each flash from the flash tube, a grating monochromator for dispersing the light delivered by the stabilizing device and for delivering a beam of filtered light, an optical element for dividing the filtered beam to produce two beams, the first of which travels through a sample for analysis and the second of which reaches a detector which delivers a reference signal corresponding to the intensity of the second beam, and a second detector placed to receive the beam emerging from the sample.
Inventors
- 👤 Rudolf Farkas
- 👤 Michel Moulin
- 👤 Georges Revillet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:48
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/255
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A spectrophotometer comprising: (a) a flash tube, (b) a stabilizing optical device for deriving from each flash from the flash tube a light beam having at the outlet of said device a spatial distribution which is substantially the same for every flash, (c) a grating monochromator for dispersing the light delivered by the stabilizing device and for delivering a beam of filtered light, (d) an optical element for driving the filtered beam to produce two beams, the first of which travels through a sample for analysis and the second of which reaches a detector which delivers a reference signal corresponding to the intensity of the second beam, and (e) a second detector placed to receive the beam emerging from the sample.
Claim 2
Dependent Claim
121 words
A spectrophotometer comprising: (a) a flash tube, (b) a stabilizing optical device for deriving from each flash from the flash tube a light beam having at the outlet of said device a spatial distribution which is substantially the same for every flash, (c) a grating monochromator for dispersing the light delivered by the stabilizing device and for delivering a beam of filtered light, (d) an optical element for driving the filtered beam to produce two beams, the first of which travels through a sample for analysis and the second of which reaches a detector which delivers a reference signal corresponding to the intensity of the second beam, and (e) a second detector placed to receive the beam emerging from the sample.
Claim 3
Dependent Claim
32 words
A spectrophotometer according to claim 1, wherein the flash tube comprises a starting electrode which is much nearer the cathode than the anode, in order to stabilize the position of the art.
Claim 4
Dependent Claim
30 words
A spectrophotometer according to claim 1, characterised in that the stabilizing device comprises a tube having reflecting internal walls for producing multiple reflections of the light beam from each flash.
Claim 5
Dependent Claim
14 words
A spectrophotometer according to claim 1, wherein the monochromator comprises a holographic concave grating.
Claim 6
Dependent Claim
37 words
A spectrophotometer according to claim 1, wherein the optical element for dividing the filtered beam is a thin quartz plate disposed so that the angle of incidence of the filtered beam is comprised between 10° and 25°.
Claim 7
Dependent Claim
26 words
A spectrophotometer according to claim 1, wherein optical element for dividing the filtered beam is a thin quartz plate comprising transparent and reflecting strips in alternation.
Claim 8
Dependent Claim
25 words
A spectrophotometer according to claim 1, wherein the stabilizing device comprises a quartz cylinder for producing multiple reflections of the light beam from each flash.
Claim 9
Dependent Claim
28 words
A spectrophotometer according to claim 1, wherein a reference or a measuring sample can be placed in each of the two filtered beams coming from the dividing element.
Claim 10
Dependent Claim
128 words
In an analyzer for performing clinical-chemical analysis, a spectrophotometer comprising: (a) a flash tube, (b) a stabilizing optical device for deriving from each flash from the flash tube a light beam having at the outlet of said device a spatial distribution which is substantially the same for every flash, (c) a grating monochromator for dispersing the light delivered by the stabilizing device and for delivering a beam of filtered light, (d) optical element means for dividing the filtered beam to produce two beams, the first of which travels through a sample for analysis and the second of which reaches a detector which delivers a reference signal corresponding to the intensity of the second beam, and (e) a second detector positioned to receive the beam emerging from the sample.
Claim 11
Dependent Claim
128 words
In an analyzer for performing clinical-chemical analysis, a spectrophotometer comprising: (a) a flash tube, (b) a stabilizing optical device for deriving from each flash from the flash tube a light beam having at the outlet of said device a spatial distribution which is substantially the same for every flash, (c) a grating monochromator for dispersing the light delivered by the stabilizing device and for delivering a beam of filtered light, (d) optical element means for dividing the filtered beam to produce two beams, the first of which travels through a sample for analysis and the second of which reaches a detector which delivers a reference signal corresponding to the intensity of the second beam, and (e) a second detector positioned to receive the beam emerging from the sample.
References Cited (Backward Citations)
US2849912A
Cited
US3009388A
Cited
US2981826A
Cited
GB1078976A
Cited
GB1126841A
Cited
GB1111632A
Cited
GB1181163A
Cited
US3599002A
Cited
US3637310A
Cited
US3810696A
Cited
US3917406A
Cited
FR2297431A1
Cited
US4068954A
Cited
US4022534A
Cited
US4076421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |