Patent US4444351A successfully refreshed from Google Patents.
US4444351A
Expired / Lapsed
US
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Method of soldering metal oxide varistors
Assignee: ELCTRIC POWER RESEARCH INSTITUTE Inc A CORP OF DISTRICT OF COLUMBIA
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Filing: 1981-11-16
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Granted: 1984-04-24
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Expires: 2001-11-16
Abstract
Abstract A method is provided for electrically interconnecting a plurality of varistors of the type formed predominantly of metal oxide. Molten solder is first applied to the receiving surfaces provided on opposite sides of each of the varistors. The molten solder is then subjected to vibrations of from 5,000 to 35,000 hertz, causing the solder to strongly adhere to the receiving surfaces. The varistor bodies are then soldered to one another along their receiving surfaces to electrically interconnect the varistor bodies. In one embodiment of the method, the applying of molten solder, vibrating the molten solder, and soldering the varistor bodies to one another are all performed substantially simultaneously by means of a vibrating solder bath.
Inventors
- 👤 Paul P. Dries
- 👤 Christopher J. Kulis
- 👤 Theodore O. Sokoly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:32
CPC Classifications
B; B23; B23K; B23K3/00; B23K3/06; B23K3/0646; B23K3/0661; H; H01; H01C; H01C1/00; H01C1/14; H01C1/144; H01C17/00; H01C17/28; H01C7/00; H01C7/10; H01C7/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
188 words
A method of electrically interconnecting a plurality of varistor bodies formed predominantly of metal oxide, comprising the steps of: applying molten solder to receiving surfaces provided on opposite sides of each said varistor body, subjecting said applied molten solder to vibrations of from 5,000 to 35,000 hertz whereby the solder strongly adheres to the receiving surfaces, and soldering a plurality of said varistor bodies to one another along their respective receiving surfaces to electrically interconnect said varistor bodies, said varistor bodies each having a pair of receiving surfaces on opposite sides thereof and an intermediate surface area extending between said receiving surfaces, said method including a preliminary masking step in which said intermediate surface of each said varistor body is masked to prevent solder from adhering to said intermediate surface area during subsequent steps in said method, said masking step including coating said intermediate surface area of each of said varistor body with solder inhibitor means for preventing adherence of solder to said varistor body thereby producing a masked varistor body, the subsequent steps in said method serving to electrically interconnect a plurality of said masked varistor bodies.
Claim 2
Independent Claim
188 words
A method of electrically interconnecting a plurality of varistor bodies formed predominantly of metal oxide, comprising the steps of: applying molten solder to receiving surfaces provided on opposite sides of each said varistor body, subjecting said applied molten solder to vibrations of from 5,000 to 35,000 hertz whereby the solder strongly adheres to the receiving surfaces, and soldering a plurality of said varistor bodies to one another along their respective receiving surfaces to electrically interconnect said varistor bodies, said varistor bodies each having a pair of receiving surfaces on opposite sides thereof and an intermediate surface area extending between said receiving surfaces, said method including a preliminary masking step in which said intermediate surface of each said varistor body is masked to prevent solder from adhering to said intermediate surface area during subsequent steps in said method, said masking step including coating said intermediate surface area of each of said varistor body with solder inhibitor means for preventing adherence of solder to said varistor body thereby producing a masked varistor body, the subsequent steps in said method serving to electrically interconnect a plurality of said masked varistor bodies.
Claim 3
Dependent Claim
62 words
A method as in claim 1 including the steps of allowing the solder to solidify after being subjected to vibrations of from 5,000 to 35,000 hertz to create a solder contact on each said receiving surface, and then soldering together the solder contacts of adjacent varistor bodies to accomplish the step of soldering a plurality of said varistor bodies to one another.
Claim 4
Dependent Claim
26 words
A method as in claim 1 in which all said steps in the method of electrically interconnecting a plurality of varistor bodies are performed substantially simultaneously.
Claim 5
Dependent Claim
77 words
A method as in claim 1 in which said step of soldering a plurality of said varistor bodies to one another includes immersing a plurality of said masked varistor bodies in a solder bath of molten solder, positioning said masked varistor bodies side-by-side with said receiving surfaces facing one another to form a column in said solder bath, and then removing said column of masked varistor bodies from said solder bath to permit solidification of the solder.
Claim 6
Dependent Claim
82 words
A method as in claim 1 in which the steps following said masking step include immersing a plurality of said masked varistor bodies in a vibrating solder bath which vibrates molten solder contained therein at frequencies of from 5,000 to 35,000 hertz, positioning said masked varistor bodies side-by-side with said receiving surfaces facing one another, to form a column in said vibrating solder bath, and then removing said column of bodies from said vibrating solder bath to permit solidification of the solder.
Claim 7
Dependent Claim
60 words
A method as in claim 1 in which said masking step further includes coating edge portions of each said receiving surface of said varistor bodies with solder inhibitor means for preventing adherence of solder to said varistor bodies such that said masked varistor bodies include surface areas which are unmasked only on a central portion of each said receiving surface.
Claim 8
Dependent Claim
38 words
A method as in claim 1 including the step of removing said solder inhibitor means from the electrically interconnected varistor bodies after said step of soldering a plurality of said varistor bodies to one another has been accomplished.
References Cited (Backward Citations)
US3005257A
Cited
US3103067A
Cited
US3266136A
Cited
US3415556A
Cited
US3430332A
Cited
US3477118A
Cited
US3697873A
Cited
US3733687A
Cited
US3744121A
Cited
US3716907A
Cited
US3742181A
Cited
DE2363172A1
Cited
US3956821A
Cited
DE2623778A1
Cited
JPS52749A
Cited
US3993236A
Cited
DE2824606A1
Cited
JPS5586680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |