US3843950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous electric heating element
Assignee: Schladitz Whiskers AG
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Filing: 1972-07-03
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Granted: 1974-10-22
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Expires: 1992-07-03
Abstract
Abstract An electric heating element for gases or liquids is formed from a porous body on whose inner surfaces is deposited a metal compound. The body or skeleton has low or negligible conductivity initially and may be made of layers of fabric or of foam material. It is heated by direct through flow of current and the metal compound is passed through in vapour form and is thermally decomposed to be deposited on the inner surfaces. The current and hence the resistance of the element can be continually monitored and the process arrested when the desired value is attained.
Inventors
- 👤 H Schladitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:49
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/10; F24H1/101; H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/141; H05B3/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
An electric heating element comprising an electrically conductive porous body the pores of which forming passages for a fluid to be heated, said porous body consisting of a plurality of layers of a fabric made of fibers selected from the group consisting of glass, quartz and carbon fibers, said layers being arranged regularly one upon each other and being connected to each other in an electrically conductive manner by a metal deposition produced by decomposition of a thermally decomposable metal compound, said metal deposition forming at the same time a metal coating on the fibers of the fabric forming said layers, and electrodes in contact with spaced apart portions of the skeleton formed by said interconnectEd layers.
Claim 2
Dependent Claim
117 words
An electric heating element comprising an electrically conductive porous body the pores of which forming passages for a fluid to be heated, said porous body consisting of a plurality of layers of a fabric made of fibers selected from the group consisting of glass, quartz and carbon fibers, said layers being arranged regularly one upon each other and being connected to each other in an electrically conductive manner by a metal deposition produced by decomposition of a thermally decomposable metal compound, said metal deposition forming at the same time a metal coating on the fibers of the fabric forming said layers, and electrodes in contact with spaced apart portions of the skeleton formed by said interconnectEd layers.
Claim 3
Dependent Claim
27 words
An element according to claim 1, in the form of a ring-like electric heating element, wherein the electrodes are provided on the inner and outer peripheries thereof.
Claim 4
Dependent Claim
25 words
An element according to claim 1, in the form of a column-like electric heating element, wherein the electrodes are provided on the end faces thereof.
Claim 5
Dependent Claim
16 words
A body according to claim 3, wherein the column has a longitudinal bore through its center.
References Cited (Backward Citations)
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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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |