US4016527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hermetically sealed film resistor
Assignee: Philips North America LLC
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Filing: 1975-09-25
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Granted: 1977-04-05
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Expires: 1995-09-25
Abstract
Abstract A hermetically sealed fixed film resistor including a coupling element of soft alloy material between the resistive element and the leads for providing strain relief. The resistive element is composed of a resistive film having coated ends composed of a refractory metallic material for providing reliable electrical and mechanical connection to the coupling element.
Inventors
- 👤 Gaylord L. Francis
- 👤 Amedeo J. Morelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:16
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/02; H01C17/28; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087; Y10T29/49098; Y10T29/49099
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
100 words
A hermetically sealed electrical device comprising an electrical component comprising a core element coated with a resistive film material, and a refractory metal coating over the ends of said core element in electrical contact with said resistive film material; a substantially cylindrical glass element surrounding said component and providing a hermetic seal; a pair of flexible metal leads axially extending from said device; and a coupling element between said component and said leads, comprising a solderable preform of a soft alloy for providing strain relief from the differential shrinking between said glass element and said electrical component at each end.
Claim 2
Dependent Claim
100 words
A hermetically sealed electrical device comprising an electrical component comprising a core element coated with a resistive film material, and a refractory metal coating over the ends of said core element in electrical contact with said resistive film material; a substantially cylindrical glass element surrounding said component and providing a hermetic seal; a pair of flexible metal leads axially extending from said device; and a coupling element between said component and said leads, comprising a solderable preform of a soft alloy for providing strain relief from the differential shrinking between said glass element and said electrical component at each end.
Claim 3
Dependent Claim
14 words
The device as defined in claim 1, wherein said refractory metal coating comprises nickel.
Claim 4
Dependent Claim
14 words
The device as defined in claim 1, wherein said refractory metal coating comprises cobalt.
Claim 5
Dependent Claim
14 words
The device as defined in claim 1, wherein said refractory metal coating comprises molybdenum.
Claim 6
Dependent Claim
14 words
The device as defined in claim 1, wherein said refractory metal coating comprises tungsten.
Claim 7
Dependent Claim
14 words
The device as defined in claim 1, wherein said refractory metal coating comprises chrome.
Claim 8
Dependent Claim
17 words
The device as defined in claim 1, wherein said core element is composed of a Forsterite ceramic.
Claim 9
Dependent Claim
34 words
The device as defined in claim 1, wherin said leads comprise an enlarged head in said device for providing a hermetic seal with said glass element, and an electrical contact with said solderable preform.
Claim 10
Dependent Claim
20 words
The device as defined in claim 1, wherein said enlarged head comprises a glass bead fused to said glass element.
Claim 11
Dependent Claim
32 words
The device as defined in claim 1, comprising a metal coating over said refractory metal coating and making contact with said coupling element, said refractory metal coating serving as a barrier layer.
Claim 12
Dependent Claim
13 words
The device as defined in claim 10, wherein said barrier layer comprises nickel.
Claim 13
Dependent Claim
13 words
The device as defined in claim 10, wherein said barrier layer comprises cobalt.
Claim 14
Dependent Claim
13 words
The device as defined in claim 10, wherein said barrier layer comprises molybdenum.
Claim 15
Dependent Claim
13 words
The device as defined in claim 10, wherein said barrier layer comprises chrome.
Claim 16
Dependent Claim
13 words
The device as defined in claim 10, wherein said barrier layer comprises tungsten.
Claim 17
Dependent Claim
17 words
The device as defined in claim 10, wherein said metal coating contacting said coupling element comprises silver.
Claim 18
Dependent Claim
17 words
The device as defined in claim 10, wherein said metal coating contacting said coupling element comprises gold.
Claim 19
Dependent Claim
17 words
The device as defined in claim 10, wherein said metal coating contacting said coupling element comprise copper.
Claim 20
Dependent Claim
83 words
An electrical device comprising: an electrical component having a coating of resistive film material over at least a portion thereof; a metal coating over the ends of said component and in electrical contact with said resistive film material; a solderable preform abutting at least a portion of said metal coating and making electrical connection therewith; a hermetically sealed enclosure surrounding said component; and a lead having an enlarged head contiguous with said enclosure and abutting said solderable preform and extending from said enclosure.
Claim 21
Dependent Claim
83 words
An electrical device comprising: an electrical component having a coating of resistive film material over at least a portion thereof; a metal coating over the ends of said component and in electrical contact with said resistive film material; a solderable preform abutting at least a portion of said metal coating and making electrical connection therewith; a hermetically sealed enclosure surrounding said component; and a lead having an enlarged head contiguous with said enclosure and abutting said solderable preform and extending from said enclosure.
Claim 22
Dependent Claim
15 words
The device as defined in claim 19, wherein said metal coating comprises a refractory metal.
Claim 23
Dependent Claim
82 words
An electrical device comprising: an electrical component having a coating of resistive film material over at least a portion thereof; an enclosure surrounding said component; a first metal coating over the ends of said component and in electrical contact with said resistive film material; a strain-relief element abutting at least a portion of said first metal coating and making electrical connection therewith; a lead having an enlarged head contiguous with said enclosure and abutting said strain-relief element and extending from said enclosure.
Claim 24
Dependent Claim
82 words
An electrical device comprising: an electrical component having a coating of resistive film material over at least a portion thereof; an enclosure surrounding said component; a first metal coating over the ends of said component and in electrical contact with said resistive film material; a strain-relief element abutting at least a portion of said first metal coating and making electrical connection therewith; a lead having an enlarged head contiguous with said enclosure and abutting said strain-relief element and extending from said enclosure.
Claim 25
Dependent Claim
16 words
The device as defined in claim 21, wherein said first metal coating comprises a refractory metal.
Claim 26
Dependent Claim
22 words
The device as defined in claim 22, further comprising a second metal coating between said first metal coating and said strain-relief element.
Claim 27
Dependent Claim
13 words
The device as defined in claim 21, wherein said enclosure is hermetically sealed.
References Cited (Backward Citations)
US2489409A
Cited
US2987813A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |