US3934477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature sensing device
Assignee: Xerox Corp
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Filing: 1974-11-13
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Granted: 1976-01-27
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Expires: 1994-11-13
Abstract
Abstract A conductive heat transfer mechanism through which energy readily flows between two bodies or systems at different temperatures. The present mechanism is embodied in a temperature sensing network for determining and controlling the surface temperature of a xerographic fuser roll. The network includes a probe shoe containing at least one temperature sensing element with the shoe being positioned in close non-contiguous relation with the moving surface of a heated fuser roll. A magnetic flux field is created within the air gap between the heated roll surface and the probe shoe and a magnetic medium, preferably being in fluid form, having a relatively high coefficient of thermal conductivity is placed within the flux field through which a rapid and efficient flow of heat is maintained.
Inventors
- 👤 Raghulinga R. Thettu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:45
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/14; G01K1/143; G01K1/16; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2039
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
Apparatus for sensing the surface temperature of a heated body including a temperature sensing element mounted within a probe, means to support the probe adjacent to the heated body in non-contiguous relation therewith so as to form an air gap therebetween, magnetic means for establishing a flux field within the air gap between the probe and the heated body, and a magnetic medium filling the air gap and having a relatively high coefficient of thermal conductivity and being supported within the magnetic flux field to effect low frictional characteristics while providing rapid thermal response.
Claim 2
Dependent Claim
94 words
Apparatus for sensing the surface temperature of a heated body including a temperature sensing element mounted within a probe, means to support the probe adjacent to the heated body in non-contiguous relation therewith so as to form an air gap therebetween, magnetic means for establishing a flux field within the air gap between the probe and the heated body, and a magnetic medium filling the air gap and having a relatively high coefficient of thermal conductivity and being supported within the magnetic flux field to effect low frictional characteristics while providing rapid thermal response.
Claim 3
Dependent Claim
30 words
The apparatus of claim 1 wherein said magnetic medium has a lower surface energy than the heated body whereby contaminants on the heated body are not attracted to the probe.
Claim 4
Dependent Claim
104 words
Apparatus for sensing the surface temperature of a heated body including a temperature sensing element mounted within a probe, means to support the probe adjacent to the heated body in non-contiguous relation therewith so as to form an air gap therebetween, magnetic means for establishing a flux field within the air gap between the probe and the heated body, and a magnetic medium having a relatively high coefficient of thermal conductivity supported within the magnetic flux field, wherein said probe is constructed of a non-permeable material and the magnetic means is arranged to direct a flux field through said probe into the air gap.
Claim 5
Dependent Claim
104 words
Apparatus for sensing the surface temperature of a heated body including a temperature sensing element mounted within a probe, means to support the probe adjacent to the heated body in non-contiguous relation therewith so as to form an air gap therebetween, magnetic means for establishing a flux field within the air gap between the probe and the heated body, and a magnetic medium having a relatively high coefficient of thermal conductivity supported within the magnetic flux field, wherein said probe is constructed of a non-permeable material and the magnetic means is arranged to direct a flux field through said probe into the air gap.
Claim 6
Dependent Claim
12 words
The apparatus of claim 1 wherein said magnetic medium is a liquid.
Claim 7
Dependent Claim
12 words
The apparatus of claim 1 wherein said magnetic medium includes magnetic particles.
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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |