US3859128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for resistive material and method of making
Assignee: Vishay Sprague Inc
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Filing: 1971-02-26
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Granted: 1975-01-07
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Expires: 1991-02-26
Abstract
Abstract A particulate glass-metal composition for fusion into a resistive film has glass-containing particles which are coated with a metal layer that is bonded to the particle surfaces. Upon fusion of the particulate composition, conduction takes place through the coalesced resistive film. The coating of the particle includes cleaning the particle surfaces and sensitizing the surfaces prior to the deposition of the metals. The glass-metal particulate composition mixed with a suitable medium is applied and fired into a film resistance.
Inventors
- 👤 Darnall P Burks
- 👤 John P Maher
- 👤 Jacob H Martin
- 👤 Jr Franklin D Frantz
- 👤 Arthur Leo Lemoine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:56
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C7/00; H01C7/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
THE METHOD OF MAKING A RESISTIVE FILM COMPRISING: A.PREPARING THE SURFACE OF GLASS-CONTAINING PARTICLES, HAVING A VITREOUS CONTENT OF 40 TO 90 PERCENT BY WEIGHT, TO ACCEPT A NUCLEATING AGENT, B. APPLYING TO THE SURFACE OF SAID PARTICLES A COLLOIDAL DEPOSIT IF NUCLEATING METAL OF COLLOIDAL SIZE SELECTED FROM THE GROUP CONSISTING OF A METAL ION GEL, A METAL HALIDE OR A PARTIALLY HYDROLYZED METAL HALIDE, C. DEPOSITING BY ELECTROLESS DEPOSITION AND BONDING ADDITIONALY METAL TO THE SURFACE OF SAID PARTICLES VIA SAID NUCLEATING METAL, SAID ADDITIONAL METAL COMPRISING AT LEAST ONE LAYER OF A MEMBER SELECTED FROM THE PLATINUM GROUP METALS, D. MIXING SAID PARTICLES WITH A SUITABLE BINDER AND APPLYING THE DISPERSED PARTICLES ONTO A REFRACTORY SUBSTRATE; AND, E. FIRING SAID DISPERSED PARTICLES AND SUBSTRATE AT A TEMPERATURE OF AT LEAST 1,000*F SO THAT SAID ADDITIONAL METAL BECOMES OXIDIZED AND INTEGRATED WITH SAID GLASSCONTAINING PARTICLES TO FORM A RESISTIVE FILM.
Claim 2
Independent Claim
152 words
THE METHOD OF MAKING A RESISTIVE FILM COMPRISING: A.PREPARING THE SURFACE OF GLASS-CONTAINING PARTICLES, HAVING A VITREOUS CONTENT OF 40 TO 90 PERCENT BY WEIGHT, TO ACCEPT A NUCLEATING AGENT, B. APPLYING TO THE SURFACE OF SAID PARTICLES A COLLOIDAL DEPOSIT IF NUCLEATING METAL OF COLLOIDAL SIZE SELECTED FROM THE GROUP CONSISTING OF A METAL ION GEL, A METAL HALIDE OR A PARTIALLY HYDROLYZED METAL HALIDE, C. DEPOSITING BY ELECTROLESS DEPOSITION AND BONDING ADDITIONALY METAL TO THE SURFACE OF SAID PARTICLES VIA SAID NUCLEATING METAL, SAID ADDITIONAL METAL COMPRISING AT LEAST ONE LAYER OF A MEMBER SELECTED FROM THE PLATINUM GROUP METALS, D. MIXING SAID PARTICLES WITH A SUITABLE BINDER AND APPLYING THE DISPERSED PARTICLES ONTO A REFRACTORY SUBSTRATE; AND, E. FIRING SAID DISPERSED PARTICLES AND SUBSTRATE AT A TEMPERATURE OF AT LEAST 1,000*F SO THAT SAID ADDITIONAL METAL BECOMES OXIDIZED AND INTEGRATED WITH SAID GLASSCONTAINING PARTICLES TO FORM A RESISTIVE FILM.
Claim 3
Dependent Claim
49 words
The method of claim 1 wherein the surface of said glass-containing particles as prepared by cleaning and etching said particles with a strong alkali, said nucleating metal is provided by a colloidal suspension of silver proteinate, and said firing is performed in a temperature range of 1,350*F to 1,750*C.
Claim 4
Dependent Claim
41 words
The method of claim 1 wherein said nucleating metal is provided by a colloidal silver suspension, and said platinum group metal is present in an amount from 10 to 60 percent by weight of the total particulate composition to be fired.
Claim 5
Independent Claim
131 words
The method of preparing a resistive film which comprises applying a nucleating agent to glass-containing particles having a vitreous content of 40 to 90 percent to sensitize the particle surfaces, depositing by electroless deposition a metal coating on the sensitized particle surfaces, applying the coated particles on a substrate wherein the improvement comprises sensitizing the surfaces of glass-containing particles with surface-adsorbed nucleating metal of colloidal size, depositing on the sensitized surface of metal of from 10 to 60 percent by weight of the total particle composition selected from the group consisting of a member selected from the platinum group metals, and fusing the deposited metal by firing at an elevated temperature of 1,350* -1,750*F to result in a film which includes both the metallic characteristic component and the semiconductive characteristic component.
Claim 6
Independent Claim
131 words
The method of preparing a resistive film which comprises applying a nucleating agent to glass-containing particles having a vitreous content of 40 to 90 percent to sensitize the particle surfaces, depositing by electroless deposition a metal coating on the sensitized particle surfaces, applying the coated particles on a substrate wherein the improvement comprises sensitizing the surfaces of glass-containing particles with surface-adsorbed nucleating metal of colloidal size, depositing on the sensitized surface of metal of from 10 to 60 percent by weight of the total particle composition selected from the group consisting of a member selected from the platinum group metals, and fusing the deposited metal by firing at an elevated temperature of 1,350* -1,750*F to result in a film which includes both the metallic characteristic component and the semiconductive characteristic component.
Claim 7
Dependent Claim
131 words
A resistive film on a non-conducting substrate consisting of a metal selected from the group consisting of a member selected from the platinum group metals deposited by electroless deposition and oxidized on a nucleating agent sensitized surface of glass-containing particles having a vitreous content of 40 to 90 percent by precipitating from a solution of a salt of said metal and firing at a temperature in the range of 1,350*F - 1, 750*F to form an integrated resistive film of the metal and the vitreous position, the proportion of the metal to the total particles composition and the oxidation and integration of deposited metal being such as to cause the resistive film to have a resistance value of the order of 6 X 102 to 3 X 105 ohms per square.
Claim 8
Dependent Claim
131 words
A resistive film on a non-conducting substrate consisting of a metal selected from the group consisting of a member selected from the platinum group metals deposited by electroless deposition and oxidized on a nucleating agent sensitized surface of glass-containing particles having a vitreous content of 40 to 90 percent by precipitating from a solution of a salt of said metal and firing at a temperature in the range of 1,350*F - 1, 750*F to form an integrated resistive film of the metal and the vitreous position, the proportion of the metal to the total particles composition and the oxidation and integration of deposited metal being such as to cause the resistive film to have a resistance value of the order of 6 X 102 to 3 X 105 ohms per square.
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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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |