US4119573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glaze resistor composition and method of making the same
Assignee: Panasonic Holdings Corp
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Filing: 1977-10-27
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Granted: 1978-10-10
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Expires: 1997-10-27
Abstract
Abstract A glaze resistor composition composed of magnesium silicide, molybdenum disilicide, tantalum disilicide and glass frit, and if necessary, manganese disilicide and/or aluminum oxide. Due to the use of magnesium silicide, glaze resistors having stable resistivities in a wide resistivity range can be obtained. Due to the use of manganese disilicide, the temperature coefficient of resistivity can be shifted to the positive side, and due to the use of aluminum oxide, the resistivity can be increased and made more stable. This invention also provides a method of making a glaze resistor using two heating steps, in which aluminum oxide is mixed in the starting powder mixture to be subjected to the first heating step, so as to enhance the effect of the aluminum oxide addition.
Inventors
- 👤 Toru Ishida
- 👤 Masumi Hattori
- 👤 Shinichi Tanaka
- 👤 Tomi Sato
- 👤 Kenji Kuwahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:24
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/22; H01C17/232; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/0656
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
75 words
A glaze resistor composition consisting essentially of 7 to 50 weight percent of a silicide component and 93 to 50 weight percent of a glass frit, said silicide component consisting essentially of magnesium silicide, molybdenum disilicide and tantalum disilicide, wherein the molar ratio of the sum of molybdenum disilicide and tantalum disilicide to magnesium silicide is from 30/70 to 90/10, and the molar ratio of molybdeum disilicide to tantalum disilicide is from 90/10 to 70/30.
Claim 2
Dependent Claim
75 words
A glaze resistor composition consisting essentially of 7 to 50 weight percent of a silicide component and 93 to 50 weight percent of a glass frit, said silicide component consisting essentially of magnesium silicide, molybdenum disilicide and tantalum disilicide, wherein the molar ratio of the sum of molybdenum disilicide and tantalum disilicide to magnesium silicide is from 30/70 to 90/10, and the molar ratio of molybdeum disilicide to tantalum disilicide is from 90/10 to 70/30.
Claim 3
Dependent Claim
29 words
A glaze resistor composition according to claim 1, wherein said molar ratio of the sum of molybdenum disilicide and tantalum disilicide to magnesium silicide is from 60/40 to 80/20.
Claim 4
Dependent Claim
23 words
A glass resistor composition according to claim 1, wherein said molar ratio of molybdenum disilicide to tantalum disilicide is from 80/20 to 70/30.
Claim 5
Dependent Claim
22 words
A glaze resistor composition according to claim 1, wherein said silicide component further contains 1 to 50 molar percent of manganese disilicide.
Claim 6
Dependent Claim
18 words
A glaze resistor composition according to claim 1, wherein said glass frit is of a barium borate glass.
Claim 7
Dependent Claim
95 words
A glaze resistor composition consisting essentially of 7 to 30 weight percent of a silicide component and 93 to 70 weight percent, in total, of aluminum oxide and a glass frit, said silicide component consisting essentially of magnesium silicide, molybdenum disilicide and tantalum disilicide, wherein the molar ratio of the sum of molybdenum disilicide and tantalum disilicide to magnesium silicide is from 30/70 to 90/10, the molar ratio of molybdenum disilicide to tantalum disilicide is from 90/10 to 70/30, and the weight ratio of said silicide component to aluminum oxide is from 30/58.5 to 70/10.
Claim 8
Dependent Claim
95 words
A glaze resistor composition consisting essentially of 7 to 30 weight percent of a silicide component and 93 to 70 weight percent, in total, of aluminum oxide and a glass frit, said silicide component consisting essentially of magnesium silicide, molybdenum disilicide and tantalum disilicide, wherein the molar ratio of the sum of molybdenum disilicide and tantalum disilicide to magnesium silicide is from 30/70 to 90/10, the molar ratio of molybdenum disilicide to tantalum disilicide is from 90/10 to 70/30, and the weight ratio of said silicide component to aluminum oxide is from 30/58.5 to 70/10.
Claim 9
Dependent Claim
29 words
A glaze resistor composition according to claim 6, wherein said molar ratio of the sum of molybdenum disilicide and tantalum disilicide to magnesium silicide is from 60/40 to 80/20.
Claim 10
Dependent Claim
23 words
A glaze resistor composition according to claim 6, wherein said molar ratio of molybdenum disilicide to tantalum disilicide is from 80/20 to 70/30.
Claim 11
Dependent Claim
22 words
A glaze resistor composition according to claim 6, wherein said silicide component further contains 1 to 50 molar percent of manganese disilicide.
Claim 12
Dependent Claim
18 words
A glaze resistor composition according to claim 6, wherein said glass frit is of a barium borate glass.
Claim 13
Independent Claim
229 words
A method of making a glaze resistor, comprising the steps of: preparing a starting powder mixture of a silicide component, aluminum oxide and a first glass frit, the weight ratio of said silicide component to the sum of aluminum oxide and said first glass frit being from 30/70 to 70/30, the weight ratio of aluminum oxide to said first glass frit being from 1/2 to 5/1, and said silicide component consisting essentially of magnesium silicide, molybdenum disilicide and tantalum disilicide, wherein the molar ratio of the sum of molybdenum disilicide and tantalum disilicide to magnesium silicide is from 30/70 to 90/10, and the molar ratio of molybdenum disilicide to tantalum disilicide is from 90/10 to 70/30; compressing said starting powder mixture into a compressed body; first heating said compressed body at a temperature between 700° C and 1300° C; grinding the thus heated body into granules; mixing said granules with a second glass frit in an amount such that said silicide component is in a range from 7 to 30 weight percent, and the sum of said aluminum oxide and first and second glass frits is in the range from 93 to 70 weight percent on the basis of the sum of said silicide component, aluminum oxide, and first and second glass frits; and second heating the thus prepared mixture at a temperature between 750° C and 1000° C.
Claim 14
Independent Claim
229 words
A method of making a glaze resistor, comprising the steps of: preparing a starting powder mixture of a silicide component, aluminum oxide and a first glass frit, the weight ratio of said silicide component to the sum of aluminum oxide and said first glass frit being from 30/70 to 70/30, the weight ratio of aluminum oxide to said first glass frit being from 1/2 to 5/1, and said silicide component consisting essentially of magnesium silicide, molybdenum disilicide and tantalum disilicide, wherein the molar ratio of the sum of molybdenum disilicide and tantalum disilicide to magnesium silicide is from 30/70 to 90/10, and the molar ratio of molybdenum disilicide to tantalum disilicide is from 90/10 to 70/30; compressing said starting powder mixture into a compressed body; first heating said compressed body at a temperature between 700° C and 1300° C; grinding the thus heated body into granules; mixing said granules with a second glass frit in an amount such that said silicide component is in a range from 7 to 30 weight percent, and the sum of said aluminum oxide and first and second glass frits is in the range from 93 to 70 weight percent on the basis of the sum of said silicide component, aluminum oxide, and first and second glass frits; and second heating the thus prepared mixture at a temperature between 750° C and 1000° C.
Claim 15
Dependent Claim
31 words
A method according to claim 11, wherein said weight ratio of said silicide component to the sum of said aluminum oxide and said first glass frit is from 55/45 to 65/35.
Claim 16
Dependent Claim
27 words
A method according to claim 11, wherein said molar ratio of the sum of molybdenum silicide and tantalum disilicide to magnesium silicide is from 60/40 to 80/20.
Claim 17
Dependent Claim
21 words
A method according to claim 11, wherein said molar ratio of molybdenum disilicide to tantalum disilicide is from 80/20 to 70/30.
Claim 18
Dependent Claim
20 words
A method according to claim 11, wherein said silicide component further contains 1 to 50 molar percent of manganese disilicide.
Claim 19
Dependent Claim
20 words
A method according to claim 11, wherein each of said first and second glass frits is a barium borate glass.
Claim 20
Dependent Claim
19 words
A method according to claim 11, wherein the temperature of said first heating is between 1050° and 1150° C.
Claim 21
Dependent Claim
20 words
A method according to claim 11, wherein the temperature of said second heating is between 800° C and 900° C.
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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |