Patent US4187434A successfully refreshed from Google Patents.
US4187434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Long life radiation shield for gas temperature measurement
Assignee: PPG Industries Inc
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Filing: 1978-08-31
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Granted: 1980-02-05
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Expires: 1998-08-31
Abstract
Abstract A suction pyrometer radiation shield comprising an elongated first alumina refractory tube, a series of smaller alumina refractory tubes arranged around and bonded to the inside surface of said first tube forming central passageway, an outer fracture resistant alumina refractory tube surrounding said first tube and an alumina refractory washer closely surrounding said first tube in abutting contact with said outer alumina refractory tube.
Inventors
- 👤 Frank R. Pater, Jr.
- 👤 Joseph M. Kapusnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:02
CPC Classifications
G; G01; G01K; G01K13/00; G01K13/02; G01K13/022; G01K1/00; G01K1/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
68 words
A suction pyrometer radiation shield comprising a. an elongated first alumina refractory tube b. a series of smaller alumina refractory tubes arranged around and bonded to the inside surface of said first tube forming a central passageway c. an outer fracture resistant alumina refractory tube surrounding said first tube d. an alumina refractory washer closely surrounding said first tube in abutting contact with said outer alumina refractory tube.
Claim 2
Dependent Claim
68 words
A suction pyrometer radiation shield comprising a. an elongated first alumina refractory tube b. a series of smaller alumina refractory tubes arranged around and bonded to the inside surface of said first tube forming a central passageway c. an outer fracture resistant alumina refractory tube surrounding said first tube d. an alumina refractory washer closely surrounding said first tube in abutting contact with said outer alumina refractory tube.
Claim 3
Dependent Claim
20 words
The shield of claim 1 wherein said alumina washer is located at about the middle of said first alumina tube.
Claim 4
Dependent Claim
17 words
The shield of claim 1 wherein said smaller alumina refractory tubes are all of substantially one size.
Claim 5
Dependent Claim
17 words
The shield of claim 1 wherein said smaller alumina refractory tubes are of more than one size.
Claim 6
Dependent Claim
24 words
The shield of claim 1 wherein interstices between said first alumina refractory tube and said smaller alumina refractory tubes are filled by refractory cement.
Claim 7
Dependent Claim
23 words
The shield of claim 1 wherein the interstices between said first alumina refractory tube and said outer refractory are filled by refractory cement.
Claim 8
Dependent Claim
33 words
The radiation shield of claim 1 wherein the interstices between said alumina refractory washer and said first tube and between said first tube and said outer refractory tube are filled by refractory cement.
Claim 9
Dependent Claim
21 words
The shield of claim 1 wherein said first alumina refractory tube has a wall thickness of at least about 1/8 inch.
Claim 10
Dependent Claim
21 words
The shield of claim 1 wherein said smaller inner refractory tubes have a wall thickness of at least about 0.005 inches.
Claim 11
Dependent Claim
26 words
The radiation shield of claim 1 wherein said outer fracture resistant alumina refractory is a tube with a wall thickness of greater than about 1/8 inch.
Claim 12
Dependent Claim
17 words
The shield of claim 10 wherein said washer has a thickness of greater than about 1/4 inch.
Claim 13
Dependent Claim
19 words
The radiation shield of claim 1 wherein said washer has a thickness of greater than about a 1/4 inch.
Claim 14
Dependent Claim
19 words
The shield of claim 1 wherein said washer has a thickness of between about 1/4 inch and 3/8 inch.
Claim 15
Dependent Claim
27 words
The radiation pyrometer shield of claim 1 wherein said washer is the same diameter as the flange of the water cooled probe with which it is used.
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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) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |