US3742601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making an electrical apparatus
Assignee: TDK Micronas GmbH
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Filing: 1972-06-19
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Granted: 1973-07-03
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Expires: 1992-06-19
Abstract
Abstract Electrical apparatus including a resistance wire ignitor for gas ranges or otherwise wherein the wire is made of molybdenum disilicide (MoSi2). The MoSi2 is very brittle, but has an exceedingly long life. The MoSi2 may have a useful life well over 18 months, continuous use in an oxidizing atmosphere, as compared to 3 days continuous use for platinum under the same conditions. A number of problems were solved according to this discovery. Shock resistance was improved by use of dead soft electrical connectors having necked down portions to take a set rather than damage the brittle wire. A good 310 stainless steel connector to wire bond was discovered. The bond is made with an alloy of 18 percent nickel and 82 percent gold. The ignitor also has a snapon shield.
Inventors
- 👤 J Raffaelli
- 👤 R Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:48
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/141; F; F23; F23Q; F23Q7/00; F23Q7/06; F23Q7/10; H05B2203/00; H05B2203/018; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
The invention as defined in claim 1, wherein said brazing compound is an alloy of about 18 percent nickel and about 82 percent gold, said conductors being made of 310 stainless steel, said wire being made of molybdenum disilicide, said heating step being performed with said oven filled with an inert gas, the oven temperature being raised to about 1,800* F.
Claim 2
Dependent Claim
39 words
The invention as defined in claim 1, wherein said brazing compound is an alloy of about 18 percent nickel and about 82 percent gold, said conductors being made of 310 stainless steel, said wire being made of molybdenum disilicide.
Claim 3
Independent Claim
169 words
The method of making an electrical ignitor, said method comprising the steps of: forming first and second conductors with ends formed in cups, said cups carrying a brazing compound; mounting said conductors on an insulator block with said cups adjacent each other and facing away from said block; supporting said insulator block and said conductors in an oven with said cups facing vertically upward; inserting one of the ends of a resistance wire ignitor in one of said cups in a position contiguous to the compound carried thereby and the other end of said ignitor in the other of said cups in a position contiguous to the compound carried thereby, said wire being made of conductive material which has a resistivity substantially higher than that of the material of which said conductors are made, both of said ignitor ends extending vertically down-wardly into their respective cups; and raising the temperature of said oven sufficiently to produce a bond between said wire ends and the respective cups by said compound.
Claim 4
Dependent Claim
15 words
The invention as defined in claim 4, wherein said wire is made of molybdenum disilicide.
Claim 5
Dependent Claim
23 words
The invention as defined in claim 5, wherein said oven is filled with an inert gas when the temperature is raised as aforesaid.
Claim 6
Dependent Claim
16 words
The invention as defined in claim 6, wherein said conductors are made of 310 stainless steel.
Claim 7
Dependent Claim
20 words
The invention as defined in claim 7, wherein said compound is about 18 percent nickel and about 82 percent gold.
Claim 8
Dependent Claim
59 words
The invention as defined in claim 5, wherein said wire ignitor ends are freely slidable into their respective cups before said bond therebetween is produced by raising said oven temperature as aforesaid, said wire ignitor having no stress therein immediately after insertion of said ends in said cups as aforesaid to aid in preventing immediate or subsequent damage thereto.
Claim 9
Dependent Claim
59 words
The invention as defined in claim 6, wherein said wire ignitor ends are freely slidable into their respective cups before said bond therebetween is produced by raising said oven temperature as aforesaid, said wire ignitor having no stress therein immediately after insertion of said ends in said cups as aforesaid to aid in preventing immediate or subsequent damage thereto.
Claim 10
Independent Claim
231 words
The method of making an electrical ignitor, said method comprising the steps of: forming first and second conductors with ends formed in cups, said cups carrying a brazing compound; placing said conductors in an insulator block in fixed positions relative thereto with said cups adjacent each other and facing away from said block; supporting said insulator block and said conductors in an oven with said cups facing vertically upward; inserting one of the ends of a resistance wire ignitor in one of said cups in a position contiguous to The compound carried thereby and the other end of said wire in the other of said cups in a position contiguous to the compound carried thereby, said wire being made of conductive material which has a resistivity substantially higher than that of the material of which said conductors are made; and raising the temperature of said oven sufficiently to produce a bond between said wire ends and the respective cups by said compound, said wire being made of molybdenum disilicide, said oven being filled with an inert gas when the temperature is raised as aforesaid, said conductors being made of 310 stainless steel, said compound being about 18 percent nickel and about 82 percent gold, said compound being bonded to the interior of each cup by bonding it to flat metal sheets which are then subsequently formed into said conductors, as aforesaid.
Claim 11
Independent Claim
186 words
The method of making an electrical ignitor, said method comprising the steps of: forming first and second conductors with ends formed in cups, said cups carrying a brazing compound; placing said conductors in an insulator block in fixed positions relative thereto with said cups adjacent each other and facing away from said block; supporting said insulator block and said conductors in an oven with said cups facing vertically upward; inserting one of the ends of a resistance wire ignitor in one of said cups in a position contiguous to the compound carried thereby and the other end of said wire in the other of said cups in a position contiguous to the compound carried thereby, said wire being made of conductive material which has a resistivity substantially higher than that of the material of which said conductors are made; and raising the temperature of said oven sufficiently to produce a bond between said wire ends and the respective cups by said compound, said compound being bonded to each cup by bonding it to flat metal sheets which are then subsequently formed into said conductors as aforesaid.
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |