Patent US4791747A successfully refreshed from Google Patents.
US4251849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trimmer capacitor
Assignee: Alps Alpine Co Ltd
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Filing: 1978-09-27
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Granted: 1981-02-17
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Expires: 1998-09-27
Abstract
Abstract A trimmer capacitor comprises a metallic plate member which is generally U-shaped, and an elongate conductor member which is to be located inside the metallic plate. Both the metallic plate member and the conductor member can be fixed to a printed circuit board. By bending the conductor member to displace it inside the metallic plate member, the electrostatic capacitance formed between the metallic plate member and the conductor member can be varied.
Inventors
- 👤 Takashi Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:57
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/18; H01; H01G; H01G5/00; H01G5/04; H05K2203/00; H05K2203/17; H05K2203/171
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
A capacitor adapted to be mounted to a printed circuit board, comprising a conductive plate member having two spaced apart side panels adapted to extend generally perpendicularly from a printed circuit board and interconnected by a base portion extending between facing end portions of said side panels, said side panels extending generally parallel to form an open end of said plate member, said plate member having a mounting portion adapted to be connected to said circuit board; and a conductor member having a fixing portion adapted to be connected to a circuit pattern on said circuit board and an elongate portion extending between said side panels, said conductor member being bendable whereby said elongate portion can be moved between a position along said base portion and a position nearer said open end to vary capacitance value between said plate member and said conductor member, said plate member further including a tab portion extending across said open end to divide it into a first open portion and a second open portion.
Claim 2
Dependent Claim
170 words
A capacitor adapted to be mounted to a printed circuit board, comprising a conductive plate member having two spaced apart side panels adapted to extend generally perpendicularly from a printed circuit board and interconnected by a base portion extending between facing end portions of said side panels, said side panels extending generally parallel to form an open end of said plate member, said plate member having a mounting portion adapted to be connected to said circuit board; and a conductor member having a fixing portion adapted to be connected to a circuit pattern on said circuit board and an elongate portion extending between said side panels, said conductor member being bendable whereby said elongate portion can be moved between a position along said base portion and a position nearer said open end to vary capacitance value between said plate member and said conductor member, said plate member further including a tab portion extending across said open end to divide it into a first open portion and a second open portion.
Claim 3
Dependent Claim
19 words
A capacitor according to claim 1 said conductor member includes a transverse portion extending through said second open portion.
Claim 4
Dependent Claim
30 words
A capacitor according to claim 2, said transverse portion being biased resiliently against said tab portion and having an electrically insulating layer between said transverse portion and said tab portion.
Claim 5
Dependent Claim
23 words
A capacitor according to claim 3, said tab portion being adapted to function as the fulcrum for the bending of said conductor member.
Claim 6
Dependent Claim
38 words
A capacitor according to claim 2, said fixing portion and said elongate portion each being generally parallel to said base portion, and said transverse portion being generally perpendicular to and interconnecting said fixing portion and said elongate portion.
Claim 7
Dependent Claim
21 words
A capacitor according to claim 1, at least said elongate portion of said conductor member having an electrically insulating layer therearound.
Claim 8
Dependent Claim
17 words
A capacitor according to claim 1, said conductor member being an electric wire coated with polyvinyl chloride.
Claim 9
Dependent Claim
14 words
A capacitor according to claim 1, said conductor member having a dielectric layer therearound.
References Cited (Backward Citations)
GB207649A
Cited
US1911360A
Cited
US3142981A
Cited
US3183912A
Cited
US3277353A
Cited
US3679940A
Cited
US3846780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |