US4123741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance element for variable resistors
Assignee: Alps Alpine Co Ltd
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Filing: 1977-06-27
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Granted: 1978-10-31
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Expires: 1997-06-27
Abstract
Abstract A resistance element for obtaining a continuous and linear output characteristic is obtained by the combination of a zig-zag resistance element and a resistance film of higher resistivity disposed thereover.
Inventors
- 👤 Tetsuhiro Kiyono
- 👤 Moritoshi Nakamura
- 👤 Jun Nakanowatari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:51
CPC Classifications
H; H01; H01C; H01C10/00; H01C10/30; H01C10/301; H01C10/303; H01C10/38; A; A47; A47B; A47B31/00; A47B2031/002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
A variable resistor comprising: an elongate, substantially planar base plate formed from an electrically insulating material; a resistance element formed in a zig-zag pattern on a surface of said base plate by depositing thereon a material having a predetermined resistivity; an elongate resistance film formed over said resistance element and extending along the central portion thereof, said resistance film being formed from a material having a resistivity higher than that of the material forming said resistance element; and a slider having a portion thereof in sliding contact with said resistance film and adapted to be moved therealong.
Claim 2
Dependent Claim
97 words
A variable resistor comprising: an elongate, substantially planar base plate formed from an electrically insulating material; a resistance element formed in a zig-zag pattern on a surface of said base plate by depositing thereon a material having a predetermined resistivity; an elongate resistance film formed over said resistance element and extending along the central portion thereof, said resistance film being formed from a material having a resistivity higher than that of the material forming said resistance element; and a slider having a portion thereof in sliding contact with said resistance film and adapted to be moved therealong.
Claim 3
Dependent Claim
19 words
A variable resistor according to claim 1, said resistance element being formed in a zig-zag pattern of varying width.
Claim 4
Dependent Claim
31 words
A variable resistor according to claim 1, said resistance element being formed in a zig-zag pattern wherein the number of back-and-forth portions thereof per unit length increase in a longitudinal direction.
Claim 5
Dependent Claim
21 words
A variable resistor according to claim 1, wherein resistance members are formed within respective turned back portions of said resistance element.
References Cited (Backward Citations)
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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) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |