US3811934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating member
Assignee: Flachglas Wernberg GmbH
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Filing: 1971-08-30
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Granted: 1974-05-21
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Expires: 1991-08-30
Abstract
Abstract A heating plate comprises a generally refractory substrate of, for example, glass upon which is deposited by flame spraying, a contact member occupying a limited portion of a surface of the substrate for connecting the heating element in an electric circuit. The contact member is preferably copper or a copperbased alloy (e.g. 90 - 99 percent by weight copper, 0 - 9 percent by weight titanium and 0 - 2 percent by weight chromium). A protective metal (conductive) layer is provided on the contact member which is directly formed on the substrate and a heating element is constituted of a further conductive layer applied over the remainder of the substrate surface and on the protective layer covering the contact member.
Inventors
- 👤 H Glaser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:22
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/02; H05B3/06; H05B3/20; H05B3/22; H05B3/26; H05B3/265; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9335; Y10S428/934; Y10S428/935; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12597; Y10T428/12611; Y10T428/12618; Y10T428/12708; Y10T428/12722; Y10T428/12771; Y10T428/12806
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
35 words
The heating plate defined in claim 1 wherein said copper alloy consists of 90 to 99 percent by weight copper, 0 to 9 percent by weight titanium and 0 to 2 percent by weight chromium.
Claim 2
Dependent Claim
23 words
The heating plate defined in claim 2 wherein said copper alloy consists of 97.3 percent copper, 2.3 percent titanium and 0.4 percent chromium.
Claim 3
Dependent Claim
19 words
The heating plate defined in claim 3 wherein said protective layer has a thickness of at most 1 micron.
Claim 4
Dependent Claim
29 words
The heating plate defined in claim 4 wherein said protective layer is a material selected from the group consisting of gold, a gold alloy, tin and a tin alloy.
Claim 5
Dependent Claim
33 words
The heating plate defined in claim 5, further comprising a diffusion-barrier layer of nickel between said contact member and said protective layer, said barrier layer having a thickness of 3 to 5 microns.
Claim 6
Independent Claim
88 words
A method of making a heating plate, comprising the steps of: Flame-spraying an electrical contact member comprising a copper alloy containing at least 1 percent by weight of titanium, chromium or a combination thereof onto a portion of the surface of an insulating substrate; coating said contact member with a protective layer of a material selected from the group consisting of gold, a gold alloy, tin and a tin alloy; and thereafter applying to said surface and said protective layer an electrically conductive layer forming a heating element.
Claim 7
Dependent Claim
28 words
The method defined in claim 7, further comprising the step of electroplating a nickel layer upon said contact member prior to the formation of said protective layer thereon.
Claim 8
Dependent Claim
16 words
The method defined in claim 7 wherein said protective layer is vapor-deposited upon said contact member.
Claim 9
Dependent Claim
19 words
The method defined in claim 7 wherein said conductive layer is vapor-deposited upon said surface and said contact member.
Claim 10
Dependent Claim
22 words
The method defined in claim 7 wherein said conductive layer is deposited by wet-chemical process upon said surface and said protective layer.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |