Patent US4277542A successfully refreshed from Google Patents.
US4277542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance material
Assignee: US Philips Corp
•
Filing: 1979-09-12
•
Granted: 1981-07-07
•
Expires: 1999-09-12
Abstract
Abstract Resistance material consisting of a mixture of metal oxidic compounds, metal oxides, a permanent binder and a temporary binder, the resistance-determining component consisting of barium-rhodate BaRh 6 O 12 . This component has a linear positive temperature coefficient of the resistance (TCR) and enables the production of a resistor having a very low TCR by combining the material with a material having a negative TCR. The resistor is obtained by firing this resistance material after it has been applied onto a substrate.
Inventors
- 👤 Alexander H. Boonstra
- 👤 Cornelis A. H. A. Mutsaers
- 👤 Franciscus N. G. R. Van der Kruijs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:17
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043; H01B; H01B1/00; H01B1/06; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/0654; H01C7/02; H01C7/021
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
43 words
A resistance material consisting essentially of a mixture of at least one metal oxidic compound, a permanent binder and a temporary binder, at least one metal oxide and, as a resistance determining component, a barium-rhodate of the formula BaRh 6 O 12 .
Claim 2
Dependent Claim
43 words
A resistance material consisting essentially of a mixture of at least one metal oxidic compound, a permanent binder and a temporary binder, at least one metal oxide and, as a resistance determining component, a barium-rhodate of the formula BaRh 6 O 12 .
Claim 3
Dependent Claim
36 words
The resistance material of claim 1 wherein in addition there is present a metal rhodate having a negative temperature coefficient of the resistance (TCR) in such a quantity that a desired level of TCR is achieved.
Claim 4
Dependent Claim
33 words
A material as claimed in claim 2, characterized in that the component having a negative TCR is a metal-rhodate of the formula M 3 Rh 7 O 15 , where M=Pb or Sr.
Claim 5
Dependent Claim
60 words
A resistor formed by applying the resistance material of claim 1 to a substrate, heating said resistance material to a temperature sufficiently high to remove said temporary binder and to cause said permanent binder to adhere to said substrate thereby uniting said substrate and said resistance material into a coherent body and providing said coherent body with electrically conductive leads.
Claim 6
Dependent Claim
11 words
A novel compound having the formula BaRh 6 O 12 .
Claim 7
Dependent Claim
11 words
A novel compound having the formula BaRh 6 O 12 .
References Cited (Backward Citations)
US3374185A
Cited
US3553109A
Cited
US3681262A
Cited
US4019168A
Cited
US4107387A
Cited
US4145470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |