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Patent US4647198A successfully refreshed from Google Patents.
US4647198A
Expired / Lapsed
US
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Optical reflectance standard for geological exploration
Assignee: Mobil Oil AS
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Filing: 1984-01-30
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Granted: 1987-03-03
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Expires: 2004-01-30
Abstract
Abstract In geological exploration, an improved optical reflectance includes a coating consisting of micropulverized PTFE powder and cement having similar spectral characteristics to the powder. The coating is bonded to a substrate and the surface of the coating is milled to a matte surface having uniform reflectance characteristics, including Lambertian response.
Inventors
- 👤 Sheldon E. Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:50
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/4785
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
In geological exploration wherein radiant energy reflected from a target is detected and converted to an electrical signal which is compared to a signal produced by detecting radiant energy from a standard to identify the geological characteristics of said target, an improved optical reflectance standard comprising: a substrate; a coating consisting of micropulverized PTFE powder and cement containing ceramic fibres and having similar spectral characteristics to said powder, said coating being bonded to said substrate, said coating having a matte surface having uniform reflectance characteristics.
Claim 2
Dependent Claim
85 words
In geological exploration wherein radiant energy reflected from a target is detected and converted to an electrical signal which is compared to a signal produced by detecting radiant energy from a standard to identify the geological characteristics of said target, an improved optical reflectance standard comprising: a substrate; a coating consisting of micropulverized PTFE powder and cement containing ceramic fibres and having similar spectral characteristics to said powder, said coating being bonded to said substrate, said coating having a matte surface having uniform reflectance characteristics.
Claim 3
Dependent Claim
15 words
The optical standard recited in claim 1 wherein said surface has a Lambertian response characteristic.
Claim 4
Dependent Claim
15 words
The standard recited in claim 1 wherein said coating is between 1/16" and 1/4" thick.
Claim 5
Dependent Claim
86 words
An improved optical reflectance standard for a radiometer of the type in which radial energy, reflected from a target, is detected and converted to an electrical signal which is compared to a signal produced by detecting radiant energy from a standard, said standard comprising: a substrate; and a coating consisting of a micropulverized PTFE powder and coating cement bonded to said substrate, said coating cement containing ceramic fibers and having similar spectral characteristics to said powder, said coating having a matte surface having uniform reflectance characteristics.
Claim 6
Dependent Claim
86 words
An improved optical reflectance standard for a radiometer of the type in which radial energy, reflected from a target, is detected and converted to an electrical signal which is compared to a signal produced by detecting radiant energy from a standard, said standard comprising: a substrate; and a coating consisting of a micropulverized PTFE powder and coating cement bonded to said substrate, said coating cement containing ceramic fibers and having similar spectral characteristics to said powder, said coating having a matte surface having uniform reflectance characteristics.
Claim 7
Dependent Claim
15 words
The optical standard recited in claim 4 wherein said surface has a Lambertian response characteristic.
Claim 8
Dependent Claim
15 words
The standard recited in claim 4 wherein said coating is between 1/16" and 1/4" thick.
Claim 9
Independent Claim
93 words
The method of making an improved optical reflectance standard for a radiometer of the type in which radiant energy is reflected from a target, detected, and converted to an electrical signal which is compared to a signal produced by detecting radiant energy reflected from a standard, said method comprising: suspending micropulverized PTFE powder in an air-setting refractory coating cement said coating cement containing ceramic fibers having similar spectral characteristics to said powder; applying the suspension to a substrate; and drying said suspension to form a coating of suspended PTFE powder on said substrate.
Claim 10
Independent Claim
93 words
The method of making an improved optical reflectance standard for a radiometer of the type in which radiant energy is reflected from a target, detected, and converted to an electrical signal which is compared to a signal produced by detecting radiant energy reflected from a standard, said method comprising: suspending micropulverized PTFE powder in an air-setting refractory coating cement said coating cement containing ceramic fibers having similar spectral characteristics to said powder; applying the suspension to a substrate; and drying said suspension to form a coating of suspended PTFE powder on said substrate.
Claim 11
Dependent Claim
16 words
The method recited in claim 7 further comprising: milling said coating to form a matte surface.
Claim 12
Dependent Claim
18 words
The method recited in claim 7 further comprising: forming said coating to a thickness between 1/16" and 1/4".
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) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |