US4038587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic disc capacitor and method of making the same
Assignee: MRA Laboratories Inc
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Filing: 1975-08-21
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Granted: 1977-07-26
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Expires: 1995-08-21
Abstract
Abstract At least one of the metallized surfaces of a ceramic disc is partially coated with a solder resist. A terminal is secured to the uncoated portion of the metallized surface by means of solder which does not adhere to the coated portion. The capacitor is trimmed to desired capacitance by abrading away the resist and the underlying metallization.
Inventors
- 👤 Kenneth J. Kaliebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:08
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/255; H01G2/00; H01G2/02; H01G2/06; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
A capacitor comprising a dielectric body having opposed surfaces, a first electrode on one of said surfaces, a second electrode on the other of said surfaces in substantial capacitive overlap with said first electrode, a coating of abradable hard insulative solder-resistant material overlying a first portion of said first electrode, a second portion of said first electrode being uncoated by said coating, terminal members attached to said second portion and to said second electrode by solder layers which physically contact and adhere to said second portion and said second electrode, a part of said one surface of the dielectric body overlying said second electrode being free of said coating and said first electrode, said first portion and said part being free of solder.
Claim 2
Dependent Claim
123 words
A capacitor comprising a dielectric body having opposed surfaces, a first electrode on one of said surfaces, a second electrode on the other of said surfaces in substantial capacitive overlap with said first electrode, a coating of abradable hard insulative solder-resistant material overlying a first portion of said first electrode, a second portion of said first electrode being uncoated by said coating, terminal members attached to said second portion and to said second electrode by solder layers which physically contact and adhere to said second portion and said second electrode, a part of said one surface of the dielectric body overlying said second electrode being free of said coating and said first electrode, said first portion and said part being free of solder.
Claim 3
Dependent Claim
21 words
The capacitor of claim 1 wherein said coating extends beyond the periphery of said first electrode into contact with said body.
Claim 4
Dependent Claim
29 words
The capacitor of claim 1 wherein said body is a ceramic disc, said electrodes are silver deposits, and said coating is of an insulative material abradable by powder abrasion.
Claim 5
Dependent Claim
29 words
The capacitor of claim 1 wherein said first portion is a major portion of said first electrode, and said second portion is a minor portion of said first electrode.
Claim 6
Dependent Claim
41 words
The capacitor of claim 1 wherein said body is a ceramic disc with said electrodes on the opposed flat surfaces of said disc, and said abradable coating is an annulus with said second portion in the open center of said annulus.
Claim 7
Independent Claim
157 words
A method of making a ceramic capacitor comprising depositing electrodes in capacitive overlapping relationship on a portion of the opposed surfaces of a ceramic body, applying an abradable coating of hard insulative solder-resistant material over a first portion of at least one of said electrodes and leaving a second portion of said one electrode uncoated as well as a part of the surface of the ceramic body, attaching terminations to said second portion and to the other of said electrodes by solder physically contacting and adhering to said second portion and to the other of said electrodes, said abradable coating being unwettable by said solder so as to leave said first portion free of solder, abrading away a part of said abradable coating and an underlying part of said first portion in capacitive overlap with said other electrode until the desired extent of capacitive overlap is achieved so as to provide a desired capacitance between said terminations.
Claim 8
Independent Claim
157 words
A method of making a ceramic capacitor comprising depositing electrodes in capacitive overlapping relationship on a portion of the opposed surfaces of a ceramic body, applying an abradable coating of hard insulative solder-resistant material over a first portion of at least one of said electrodes and leaving a second portion of said one electrode uncoated as well as a part of the surface of the ceramic body, attaching terminations to said second portion and to the other of said electrodes by solder physically contacting and adhering to said second portion and to the other of said electrodes, said abradable coating being unwettable by said solder so as to leave said first portion free of solder, abrading away a part of said abradable coating and an underlying part of said first portion in capacitive overlap with said other electrode until the desired extent of capacitive overlap is achieved so as to provide a desired capacitance between said terminations.
Claim 9
Dependent Claim
30 words
The method of claim 6 wherein said abradable coating is an insulative phenolic material, and said abrading away is by an air stream of abrasive material directed at said part.
Claim 10
Dependent Claim
44 words
The method of claim 6 wherein said ceramic body is a disc with said electrodes being deposited on the opposed flat surfaces of said disc, and said abradable coating is an annulus with said second portion being in the open center of said annulus.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |