US4713729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for avoiding local overheating on measuring transducers
Assignee: Vodafone GmbH
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Filing: 1987-03-19
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Granted: 1987-12-15
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Expires: 2007-03-19
Abstract
Abstract In order to avoid local overheating on the surface of an intrinsically safe measuring transducer provided with current limiting resistors and embedded in a sealing composition, a body of a good heat conducting material is arranged within the sealing composition in the vicinity of the current limiting resistors.
Inventors
- 👤 Kurt Eiermann
- 👤 Karl Ehinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:43
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/20; H05K7/2039; H05K7/20509
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A device for avoiding local overhating comprising: an intrinsically safe measuring transducer; a sealing composition in which said transducer is embedded; a current limiting resistor connected to said transducer; and a single body made of a good heat conducting material spaced from but within the direct vicinity of the current limiting resistor and entirely embedded within said sealing composition so as to distribute heat more uniformly over the entire surface of said sealing composition than when said body is not present, said single body being the only good heat conducting material of said device so that heat is not dissipated at said surface of said sealing composition by other good heat conducting materials.
Claim 2
Independent Claim
113 words
A device for avoiding local overhating comprising: an intrinsically safe measuring transducer; a sealing composition in which said transducer is embedded; a current limiting resistor connected to said transducer; and a single body made of a good heat conducting material spaced from but within the direct vicinity of the current limiting resistor and entirely embedded within said sealing composition so as to distribute heat more uniformly over the entire surface of said sealing composition than when said body is not present, said single body being the only good heat conducting material of said device so that heat is not dissipated at said surface of said sealing composition by other good heat conducting materials.
Claim 3
Dependent Claim
21 words
A device according to claim 1 wherein the body is made of copper or aluminum or of both copper and aluminum.
Claim 4
Dependent Claim
16 words
A device according to claim 2 wherein the body is in the form of a plate.
Claim 5
Dependent Claim
22 words
A device according to claim 1 wherein the body is made of beryllium oxide, aluminum oxide, aluminum nitride, or a mixture thereof.
Claim 6
Dependent Claim
16 words
A device according to claim 4 wherein the body is in the form of a plate.
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) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |