Patent US4103689A successfully refreshed from Google Patents.
US3670091A
Expired / Lapsed
US
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Encapsulated electrical components with protective pre-coat containing collapsible microspheres
Assignee: SQRAGUE ELECTRIC CO
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Filing: 1971-05-20
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Granted: 1972-06-13
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Expires: 1991-05-20
Abstract
Abstract A compressible medium is dispersed throughout a somewhat flexible matrix, so as to provide a pre-coat for encapsulated electrical components that reduces the stresses occurring thereon. The stresses relieved could be produced either from the component or from the outer encapsulant. The design of the system is such that the low pressures exerted during the application of the final coating do not substantially collapse or render useless the effective stress reducing characteristics of the intermediate pre-coat.
Inventors
- 👤 Franklin D Frantz
- 👤 Salvatore J Acello
- 👤 Harold I Geller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:58
CPC Classifications
H; H01; H01G; H01G2/00; H01G2/12; Y; Y10; Y10S; Y10S264/00; Y10S264/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
The encapsulated electrical component of claim 1 wherein said compressible medium is air.
Claim 2
Dependent Claim
73 words
The encapsulated electrical component of claim 2 wherein said collapsible spheres have a compressive strength that is less than that of the encapsulant and the flexible matrix, but is at least 1,000 psi, and is oF at least one collapsible material from the group consisting of glass, polystyrene, acrylonitrile-butadienestyrene and a phenolic compound; said flexible matrix is at least one member selected from the group consisting of thermosetting binders, varnish, and epoxy resins.
Claim 3
Dependent Claim
55 words
The encapsulated electrical component of claim 3 wherein said flexible matrix is nearly saturated with said collapsible spheres, and the resultant mixture therefrom has a consistency approaching the point of dilatancy; and said collapsible spheres have a diameter that ranges in size from 10 to 250 microns, and a wall thickness of approximately 2 microns.
Claim 4
Dependent Claim
20 words
The encapsulated electrical component of claim 4 wherein said collapsible spheres are of glass, and said flexible matrix is varnish.
Claim 5
Dependent Claim
24 words
The encapsulated electrical component of claim 4 wherein said collapsible spheres are of a phenolic compound, and said flexible matrix is an epoxy resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |