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US4774491A
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Metal film resistors
Assignee: US Philips Corp
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Filing: 1987-05-15
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Granted: 1988-09-27
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Expires: 2007-05-15
Abstract
Abstract A metal film resistors consisting of an Ni-Al alloy with an Al content of at least 14.5 and at most 22% by weight with a maximum of 2.5% by weight of compatible contaminants are disclosed. Those can be used in the resistance range between 0.5 Ohm and 5 KOhm, are very stable and can be obtained with a low temperature coefficient of the resistance below ±50 ppm/° C. between -55° C.-+150° C.
Inventors
- 👤 Ludovicus Vugts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:30
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/02; H01C7/00; H01C7/006; H01C17/06; H01C17/075; H01C17/12; H01C7/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
56 words
An electric metal film resistor having a nickel alloy as a resistance material, characterized in that the resistance material consists of an alloy of nickel and aluminum with an aluminum content of from 14.5% to 22% by weight, the balance being nickel and compatible contaminants, said contaminants being present in a maximum of 2.5% by weight.
Claim 2
Dependent Claim
56 words
An electric metal film resistor having a nickel alloy as a resistance material, characterized in that the resistance material consists of an alloy of nickel and aluminum with an aluminum content of from 14.5% to 22% by weight, the balance being nickel and compatible contaminants, said contaminants being present in a maximum of 2.5% by weight.
Claim 3
Dependent Claim
38 words
An electric metal film resistor as claimed in claim 1, characterized in that the resistance material consists of an alloy of nickel and aluminum with an aluminum content of at least 16.5 and at most 18.5% by weight.
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) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |