Patent US3629781A successfully refreshed from Google Patents.
US3629781A
Expired / Lapsed
US
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Cylindrically molded metal film resistor
Assignee: Sprague Electric Co
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Filing: 1969-12-04
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Granted: 1971-12-21
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Expires: 1989-12-04
Abstract
Abstract A metal film resistor formed on a flat chip and encapsulated within an insulative compound by a molding process which forms a cylindrical resistor having axial leads.
Inventors
- 👤 Walter Helgeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:41
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/22; H01C17/24; H01C17/242; H01C1/00; H01C1/02; H01C1/034; H01C7/00; H01C7/006
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
A resistor comprising an electrically nonconductive flat thin ceramic base having an electrically resistive noble metal film deposited over the full width of a broad substantially rectangular surface thereof; a pair of spaced metal electrodes having the full width of said base and in electrical contact with said resistive film at opposite eNds of said base; a pair of metal leads soldered in direct electrical contact to said pair of electrodes, said leads being shaped and oriented in axial alignment along the long axis of said base; and an insulative substance molded around said base, entirely encapsulating it so as to form a cylinder having its center axis in the same line as said leads and of approximately the same length as said base and having a diameter approximately equal to the width of said base.
Claim 2
Dependent Claim
136 words
A resistor comprising an electrically nonconductive flat thin ceramic base having an electrically resistive noble metal film deposited over the full width of a broad substantially rectangular surface thereof; a pair of spaced metal electrodes having the full width of said base and in electrical contact with said resistive film at opposite eNds of said base; a pair of metal leads soldered in direct electrical contact to said pair of electrodes, said leads being shaped and oriented in axial alignment along the long axis of said base; and an insulative substance molded around said base, entirely encapsulating it so as to form a cylinder having its center axis in the same line as said leads and of approximately the same length as said base and having a diameter approximately equal to the width of said base.
Claim 3
Dependent Claim
40 words
The resistor of claim 1 wherein said base is alumina, said resistive film is selected from a platinum group metal, an alloy of members of this group, and an alloy of one or more members of this group with gold.
Claim 4
Dependent Claim
40 words
The resistor of claim 1 wherein the resistance value is adjusted by an L-shaped cut through said resistive film, said cut originating from the side of said film and terminating in a right angle cut toward one of said electrodes.
Claim 5
Dependent Claim
16 words
The resistor of claim 2 wherein said insulative substance is selected from epoxy, phenolic and silicone.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |