US4317104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Precision resistor for measurement purposes
Assignee: Leopold Kostal GmbH and Co KG
•
Filing: 1979-11-07
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Granted: 1982-02-23
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Expires: 1999-11-07
Abstract
Abstract A precision resistor for use in electrical circuits arranged on printed circuit boards is produced from a band of thermally conductive alloy. The band is selectively surface treated with a conductive coating to improve solderability in the region of the resistor where it is connected to conductors of the circuit board.
Inventors
- 👤 Eduard Bergmann
- 👤 Wolfgang Bonczek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:02
CPC Classifications
H; H01; H01C; H01C3/00; H01C3/06; G; G01; G01R; G01R1/00; G01R1/20; G01R1/203; H01C1/00; H01C1/01; H01C1/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A precision resistor for use in electrical circuits arranged on printed circuit boards, said resistor comprising a single piece produced by punching or stamping said resistor from a flat band of thermally conductive alloy selectively surface treated with a conductive coating in confined areas on said resistor so as to improve solderability of the resistor to conductors of a circuit board, said resistor being formed at portions thereof which are to be mounted to said board with spaced feet by means of which the resistor can be soldered to the conductors of a circuit board, each of said feet being formed with two spaced toes; both surfaces of said resistor which encompass said feet being treated with said conductive coating.
Claim 2
Dependent Claim
120 words
A precision resistor for use in electrical circuits arranged on printed circuit boards, said resistor comprising a single piece produced by punching or stamping said resistor from a flat band of thermally conductive alloy selectively surface treated with a conductive coating in confined areas on said resistor so as to improve solderability of the resistor to conductors of a circuit board, said resistor being formed at portions thereof which are to be mounted to said board with spaced feet by means of which the resistor can be soldered to the conductors of a circuit board, each of said feet being formed with two spaced toes; both surfaces of said resistor which encompass said feet being treated with said conductive coating.
Claim 3
Dependent Claim
18 words
The precision resistor of claim 1 wherein said resistor is bent so as to be U-shaped in cross-section.
Claim 4
Dependent Claim
46 words
The precision resistor of claim 1 wherein one toe on each foot is broader than the other, with the broader toe being soldered into a circuit carrying the higher current, while the narrow toe is adapted to contact and form part of a measuring current circuit.
Claim 5
Dependent Claim
18 words
The precision resistor of claim 1 wherein said conductive coating is in the form of a copper coating.
Claim 6
Dependent Claim
17 words
The precision resistor of claim 4 wherein a coating of tin is applied over said copper coating.
Claim 7
Dependent Claim
14 words
The precision resistor of claim 1 wherein said conductive coating comprises a precious metal.
References Cited (Backward Citations)
US2019457A
Cited
US2956696A
Cited
US2883502A
Cited
US3496513A
Cited
US3964943A
Cited
FR2397705A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |