US3885879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual beam spectrophotometer utilizing a spectral wedge and bifurcated fiber optic bundle
Assignee: Honeywell International Inc
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Filing: 1973-06-25
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Granted: 1975-05-27
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Expires: 1993-06-25
Abstract
Abstract A spectrophotometer including an adjustable spectral wedge, interposed between a light source and photosensitive means, for selecting wavelengths of light and improved fiber optics for transmitting the selected wavelengths to a sample to be analyzed. Single and dual beam spectrophotometers are disclosed.
Inventors
- 👤 Nevitt M Louder
- 👤 Warren G Gillingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:42
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/255
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
A spectrophotometer comprising: A. a source of light; B. an adjustable wedge for selecting wavelengths of light from the source; C. a reference means and a measuring means for sensing the selected wavelengths; D. bifurcated fiber optics comprising a bundle of light conductive threads, one end of the bundle being of rectangular cross section and disposed adjacent the wedge, the opposite end of the bundle being divided into two branches, each branch containing approximately one half of the number of threads in the end of rectangular cross section, one branch being so positioned to transmit light through a sample to be analyzed to the measuring means and the other branch being so positioned to transmit light to the reference means; and E. means for comparing the output of the sensing means.
Claim 2
Dependent Claim
131 words
A spectrophotometer comprising: A. a source of light; B. an adjustable wedge for selecting wavelengths of light from the source; C. a reference means and a measuring means for sensing the selected wavelengths; D. bifurcated fiber optics comprising a bundle of light conductive threads, one end of the bundle being of rectangular cross section and disposed adjacent the wedge, the opposite end of the bundle being divided into two branches, each branch containing approximately one half of the number of threads in the end of rectangular cross section, one branch being so positioned to transmit light through a sample to be analyzed to the measuring means and the other branch being so positioned to transmit light to the reference means; and E. means for comparing the output of the sensing means.
Claim 3
Dependent Claim
26 words
A spectrophotometer as set forth in claim 1 wherein the spectral wedge is adjustable over a range of wavelengths from about 400 to about 700 nanometers.
Claim 4
Dependent Claim
21 words
A spectrophotometer as set forth in claim 1 in which the sensing means comprises a reference cell and a measuring cell.
Claim 5
Dependent Claim
21 words
A spectrophotometer as set forth in claim 1 and including means for displaying the comparison of the output of the cells.
Claim 6
Dependent Claim
16 words
A spectrophotometer as set forth in claim 4 in which the display means is a micro-ammeter.
Claim 7
Dependent Claim
42 words
A spectrophotometer as set forth in claim 1 wherein the end of the fiber optics adjacent the wedge has a substantially rectangular cross-section of a length approximately the height of the light of the wedge and a width of approximately 20 nanometers.
Claim 8
Dependent Claim
29 words
A spectrophotometer as set forth in claim 1 wherein the light source is a single filament lamp which presents an elongated light pattern on a face of the wedge.
Claim 9
Dependent Claim
31 words
A spectrophotometer as set forth in claim 1 and having means for holding a sample disposed between the end of one brancH of the fiber optics bundle and the measuring means.
Claim 10
Dependent Claim
28 words
A spectrophotometer as set forth in claim 8 in which the end of one branch of the fiber optics bundle is directly connected to the sample holding means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |