US4459043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflective elements and sensors including reflective elements
Assignee: SMITHS INDUSTRIES A BRITISH Co PLC
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Filing: 1981-10-30
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Granted: 1984-07-10
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Expires: 2001-10-30
Abstract
Abstract A radiation pyrometer, or other optical sensor, has a mirror assembly capable of withstanding high temperatures. The mirror assembly is a block of a steel containing between 15 and 20% chromium, 4.0 and 5.2% aluminium, 0.05 and 0.4% yttrium, 0.2 and 0.4% silicon, and 0.00 and 0.03% carbon. A reflective surface on the assembly is provided by an aluminium oxide layer. The assembly is formed by heating a body of the steel such as to produce the aluminium oxide layer which is then polished to a reflective finish. After heating, the body is machined to the desired shape of the mirror assembly.
Inventors
- 👤 Douglas V. Luke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:47
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/0022; G01J5/0088; G01J5/02; G01J5/04; G01J5/041; G01J5/08; G01J5/0813; G01J5/0818; G02; G02B; G02B23/00; G02B23/24; G02B23/2476; G02B23/2492; G02B7/00; G02B7/18; G02B7/182; G01J5/046
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
32 words
A reflective element of a steel containing chromium, aluminium and yttrium that is heat treated so as to provide an aluminum oxide surface, said surface polished so as to be specularly reflective.
Claim 2
Dependent Claim
32 words
A reflective element of a steel containing chromium, aluminium and yttrium that is heat treated so as to provide an aluminum oxide surface, said surface polished so as to be specularly reflective.
Claim 3
Dependent Claim
25 words
A reflective element according to claim 1, wherein said steel contains between 15 and 22% chromium, 4.0 and 5.2% aluminium and 0.05 and 0.4% yttrium.
Claim 4
Dependent Claim
22 words
A reflective element according to claim 2, wherein said steel also contains between 0.2 and 0.4% silicon and 0.00 and 0.03% carbon.
Claim 5
Dependent Claim
31 words
A reflective element according to claim 1, wherein said element is a solid body of substantially prismatic shape, and wherein said reflective surface is inclined to the axis of said body.
Claim 6
Dependent Claim
62 words
A radiation sensor including photosensing means for sensing radiation and a reflective element, said element having a specularly reflective surface arranged to direct radiation towards said photosensing means, wherein said reflective element is of a steel containing chromium, aluminium and yttrium that is heat treated so as to provide an aluminum oxide surface said surface polished so as to be specularly reflective.
Claim 7
Dependent Claim
62 words
A radiation sensor including photosensing means for sensing radiation and a reflective element, said element having a specularly reflective surface arranged to direct radiation towards said photosensing means, wherein said reflective element is of a steel containing chromium, aluminium and yttrium that is heat treated so as to provide an aluminum oxide surface said surface polished so as to be specularly reflective.
Claim 8
Dependent Claim
62 words
A radiation pyrometer including photosensing means for sensing radiation and a reflective element, said element having a specularly reflective surface arranged to direct radiation towards said photosensing means, wherein said reflective element is of a steel containing chromium, aluminium and yttrium that is heat treated so as to provide an aluminum oxide surface, said surface polished so as to be specularly reflective.
Claim 9
Dependent Claim
62 words
A radiation pyrometer including photosensing means for sensing radiation and a reflective element, said element having a specularly reflective surface arranged to direct radiation towards said photosensing means, wherein said reflective element is of a steel containing chromium, aluminium and yttrium that is heat treated so as to provide an aluminum oxide surface, said surface polished so as to be specularly reflective.
Claim 10
Dependent Claim
24 words
The radiation sensor of claim 5 wherein said steel contains between 15 and 22% chromium, 4.0 and 5.2% aluminum, and 0.05 and 0.4% yttrium.
Claim 11
Dependent Claim
21 words
The radiation sensor of claim 7 wherein said steel also contains between 0.2 and 0.4% silicon and 0.00 and 0.03% carbon.
Claim 12
Dependent Claim
31 words
The radiation sensor of claim 5 wherein said reflective element is a solid body of substantially prismatic shape and wherein said reflective surface is inclined to the axis of said body.
Claim 13
Dependent Claim
24 words
The radiation pyrometer of claim 6 wherein said steel contains between 15 and 22% chromium, 4.0 and 5.2% aluminum, and 0.05 and 0.4% yttrium.
Claim 14
Dependent Claim
21 words
The radiation pyrometer of claim 10 wherein said steel also contains between 0.2 and 0.4% silicon and 0.00 and 0.03% carbon.
Claim 15
Dependent Claim
31 words
The radiation pyrometer of claim 11 wherein said reflective element is a solid body of substantially prismatic shape and wherein said reflective surface is inclined to the axis of said body.
Claim 16
Dependent Claim
31 words
The radiation pyrometer of claim 6 wherein said reflective element is a solid body of substantially prismatic shape and wherein said reflective surface is inclined to the axis of said body.
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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) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |