US3880522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature disappearing filament optical pyrometer
Assignee: United States Steel Corp
•
Filing: 1973-09-05
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Granted: 1975-04-29
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Expires: 1993-09-05
Abstract
Abstract An optical pyrometer focuses radiant energy images from a hot object and a measuring wire on the receiving screen of an image converter. The temperature, which can be as low as 1000* F, is then determined by brightness match of visual images on the viewing screen of the image converter.
Inventors
- 👤 Thomas P Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:28
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/52; G01J5/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
A low temperature disappearing filament optical pyrometer for measuring the temperature of a hot object comprising an image converter having a receiving screen for receiving a radiant energy image of a hot object, said converter having a viewing screen for displaying visually the image received on the receiving screen with a brightness varying with the intensity of the radiation received, a wire heated by passage of an electric current through the wire, an optical system for focusing the radiant energy imagE of the hot object whose temperature is to be measured and the heated wire on the receiving screen, and means for varying the current through the wire thereby varying the brightness of its visual image on the viewing screen.
Claim 2
Dependent Claim
120 words
A low temperature disappearing filament optical pyrometer for measuring the temperature of a hot object comprising an image converter having a receiving screen for receiving a radiant energy image of a hot object, said converter having a viewing screen for displaying visually the image received on the receiving screen with a brightness varying with the intensity of the radiation received, a wire heated by passage of an electric current through the wire, an optical system for focusing the radiant energy imagE of the hot object whose temperature is to be measured and the heated wire on the receiving screen, and means for varying the current through the wire thereby varying the brightness of its visual image on the viewing screen.
Claim 3
Dependent Claim
20 words
A pyrometer according to claim 1 in which the image converter has a peak spectral response in the infrared region.
Claim 4
Dependent Claim
38 words
A pyrometer according to claim 2 which includes a filter in the optical system for passing a narrow band of radiant energy including said peak spectral response from the hot object and the wire to the receiving screen.
Claim 5
Dependent Claim
13 words
A pyrometer according to claim 3 which includes means for rotating said wire.
Claim 6
Dependent Claim
13 words
A pyrometer according to claim 1 which includes means for rotating said wire.
References Cited (Backward Citations)
US2252015A
Cited
US3752983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |