US3791737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrometer in which a desired number of spectral lines are focused at one fixed output slit
Assignee: Individual
•
Filing: 1972-06-16
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Granted: 1974-02-12
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Expires: 1992-06-16
Abstract
Abstract A spectrometer where spectral lines within a wide wavelength range with a high resolution can be focused at one fixed output slit by using a diffraction grating which consists of separate areas having different numbers of grooves per unit length, the grating being arranged to refract spectral lines in superimposition or in alignment with each other, the instrument being suitable for flame photometer determination of substances.
Inventors
- 👤 A Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:49
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12; G01J3/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
Spectrometer in which a desired number of partial spectra can be focused at one single fixed output slit, characterized in that it comprises a grating unit consisting of a number of separate gratings located in alignment with each other in a direction parallel to the grooves of the gratings, an input slit, means for directing light from said input slit towards said grating unit, a fixed output slit and means for focusing light split up by said grating unit on said output slit, the grating constants of the different gratings being chosen so as to focus predetermined wavelength ranges at said output slit.
Claim 2
Dependent Claim
103 words
Spectrometer in which a desired number of partial spectra can be focused at one single fixed output slit, characterized in that it comprises a grating unit consisting of a number of separate gratings located in alignment with each other in a direction parallel to the grooves of the gratings, an input slit, means for directing light from said input slit towards said grating unit, a fixed output slit and means for focusing light split up by said grating unit on said output slit, the grating constants of the different gratings being chosen so as to focus predetermined wavelength ranges at said output slit.
Claim 3
Dependent Claim
21 words
Spectrometer according to claim 1, characterized in said said grating unit consists of a plane integral substrate provided with said gratings.
Claim 4
Dependent Claim
28 words
spectrometer according to claim 1, characterized inthat the optical unit is designed so as to focus in that partial spectra at a common point at the exit slit.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |