Patent US4047032A successfully refreshed from Google Patents.
US4047032A
Expired / Lapsed
US
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Standard for spectral reflectance
Assignee: REVGROUP PANTRY MIRROR CORP A DE CORP
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Filing: 1975-06-09
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Granted: 1977-09-06
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Expires: 1995-06-09
Abstract
Abstract A standard, which is of ceramic material and preferably includes alumina, for spectral reflectance for use in near infrared reflectance measurements of constituents of samples, which constituents comprise oil, moisture and protein. The standard reflects electromagnetic radiation in the wavelength range of 1.0 - 2.5 micrometers and exhibits its best optical characteristics in the operational range of 1.4 - 2.4 micrometers.
Inventors
- 👤 John F. X. Judge
- 👤 Jerome Salpeter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:45
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/4785
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
In an analyzer for quantitation of at least one constituent of interest of a sample by near infrared reflectance measurements, having means for irradiating a sample and a calibrating standard with light in the near infrared spectral region, detector means for receiving diffuse reflected light from said sample and said standard, said standard having known reflectance characteristics in said spectral region, and means displaying the analytical results, the improvement wherein: said standard comprises a fired ceramic element having a surface for irradiation by said irradiating means to diffusely reflect said light, said element further having a thickness to be self-supporting and having diffusivity and relatively low transmissive characteristics such that the characteristics of said reflected light are substantially determined by the material composing said element and are essentially optically flat in the wavelength range of 1.4 - 2.4 micrometers.
Claim 2
Dependent Claim
139 words
In an analyzer for quantitation of at least one constituent of interest of a sample by near infrared reflectance measurements, having means for irradiating a sample and a calibrating standard with light in the near infrared spectral region, detector means for receiving diffuse reflected light from said sample and said standard, said standard having known reflectance characteristics in said spectral region, and means displaying the analytical results, the improvement wherein: said standard comprises a fired ceramic element having a surface for irradiation by said irradiating means to diffusely reflect said light, said element further having a thickness to be self-supporting and having diffusivity and relatively low transmissive characteristics such that the characteristics of said reflected light are substantially determined by the material composing said element and are essentially optically flat in the wavelength range of 1.4 - 2.4 micrometers.
Claim 3
Dependent Claim
142 words
In an analyzer for quantitation of at least one constituent of interest of a sample by near infrared reflectance measurements, having means for irradiating a sample and a calibrating standard with light in the near infrared spectral region, detector means for receiving diffuse reflected light from said sample and said standard, such standard having known reflectance characterisitics in said spectral region, and means displaying the analytical results, the improvement wherein: said standard comprises a fired ceramic element having a surface for irradiation by said irradiating means to diffusely reflect said light, said element further having thickness to be self-supporting and having diffusivity and relatively low transmissive characteristics such that the characteristics of said reflected light are substantially determined by the material comprising said element and are essentially optically flat in the wavelength range of 1.4-2.4 micrometers, and wherein said standard comprises alumina.
Claim 4
Dependent Claim
142 words
In an analyzer for quantitation of at least one constituent of interest of a sample by near infrared reflectance measurements, having means for irradiating a sample and a calibrating standard with light in the near infrared spectral region, detector means for receiving diffuse reflected light from said sample and said standard, such standard having known reflectance characterisitics in said spectral region, and means displaying the analytical results, the improvement wherein: said standard comprises a fired ceramic element having a surface for irradiation by said irradiating means to diffusely reflect said light, said element further having thickness to be self-supporting and having diffusivity and relatively low transmissive characteristics such that the characteristics of said reflected light are substantially determined by the material comprising said element and are essentially optically flat in the wavelength range of 1.4-2.4 micrometers, and wherein said standard comprises alumina.
References Cited (Backward Citations)
US3504963A
Cited
US3776642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |