US3896284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin-film microelectronic resistors
Assignee: Microsystems International Ltd
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Filing: 1974-03-11
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Granted: 1975-07-22
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Expires: 1994-03-11
Abstract
Abstract The present invention relates to a number of layers of resistive materials superimposed upon an area of the substrate, the material of highest resistivity being deposited first, and therefore at the bottom of the stack, and the remaining layers being deposited in decreasing order of resistivity. Thereafter the layers are selectively trimmed to give required values.
Inventors
- 👤 Edward S B Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:44
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/006
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
A MULTI-LAYER RESISTOR ASSEMBLY COMPRISING A SUBSTRATE MEMBER HAVING TWO LAYERS OF ELECTRICALLY CONDUCTIVE MATERIAL THEREUPON EXTENDING BETWEEN TERMINAL MEANS FOR SAID RESISTOR, THE FIRST LAYER, ADJACENT SAID SUBSTRATE, BEING COMPRISED OF CHROMIUM, AND THE SECOND LAYER, OF DECREASED RESISTIVITY WITH RESPECT TO THE FIRST LAYER COMPRISED OF TANALUM.
Claim 2
Dependent Claim
49 words
A MULTI-LAYER RESISTOR ASSEMBLY COMPRISING A SUBSTRATE MEMBER HAVING TWO LAYERS OF ELECTRICALLY CONDUCTIVE MATERIAL THEREUPON EXTENDING BETWEEN TERMINAL MEANS FOR SAID RESISTOR, THE FIRST LAYER, ADJACENT SAID SUBSTRATE, BEING COMPRISED OF CHROMIUM, AND THE SECOND LAYER, OF DECREASED RESISTIVITY WITH RESPECT TO THE FIRST LAYER COMPRISED OF TANALUM.
Claim 3
Dependent Claim
50 words
A multi-layer resistor assembly comprising a substrate member having two layers of electrically conductive material thereupon extending between terminal means for said resistor, the first layer, adjacent said substrate, being comprised of nichrome, and the second layer, of decreased resistivity with respect to the first layer, being comprised of tantalum.
Claim 4
Dependent Claim
50 words
A multi-layer resistor assembly comprising a substrate member having two layers of electrically conductive material thereupon extending between terminal means for said resistor, the first layer, adjacent said substrate, being comprised of nichrome, and the second layer, of decreased resistivity with respect to the first layer, being comprised of tantalum.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |