US5218334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface mountable high current resistor
Assignee: Motorola Solutions Inc
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Filing: 1992-06-19
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Granted: 1993-06-08
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Expires: 2012-06-19
Abstract
Abstract A surface mountable, high current resistor (20) is formed generally in the shape of an inverted "U". The top portion (22) of the inverted "U" is flat and contains one or more openings (26, 27) that serve to alter the resistivity of the resistor. The openings are formed so as to be inverted mirror images of each other, thereby cancelling inductive effects introduced by the openings. The ends of the "U" are formed into two or more legs (24) that serve to provide stability and a mounting area for soldering the resistor to a printed circuit board. A flat, unbroken portion (28) in the center of the resistor serves as a convenient area to handle the resistor with a vacuum tool during printed circuit assembly.
Inventors
- 👤 Michael H. Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:08
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/006; H01C3/00; H01C3/02; H01C3/10; H01C3/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
73 words
A surface mountable electrical resistor, comprising: a metal stamping having an electrically resistive characteristic, the metal stamping having a major surface and at least two legs, each leg serving to provide electrical connection and formed into a right angle so as to provide a surface mountable portion to a printed circuit board and; the major surface being formed into a pattern by means of one or more openings formed in the major surface.
Claim 2
Dependent Claim
73 words
A surface mountable electrical resistor, comprising: a metal stamping having an electrically resistive characteristic, the metal stamping having a major surface and at least two legs, each leg serving to provide electrical connection and formed into a right angle so as to provide a surface mountable portion to a printed circuit board and; the major surface being formed into a pattern by means of one or more openings formed in the major surface.
Claim 3
Dependent Claim
25 words
The surface mountable electrical resistor as described in claim 1, wherein the openings formed in the major surface comprise one or more squared spiral patterns.
Claim 4
Dependent Claim
31 words
The surface mountable electrical resistor as described in claim 1, wherein the openings formed in the major surface comprise one or more openings formed generally in the shape of a "S".
Claim 5
Dependent Claim
18 words
The surface mountable electrical resistor as described in claim 1, wherein the pattern comprises two complimentary spiral patterns.
Claim 6
Dependent Claim
33 words
The surface mountable electrical resistor as described in claim 1, wherein the metal stamping is selected from the group consisting of nichrome, steel, copper, chrome, stainless steel, alloy 42, nickel, constantan, and kovar.
Claim 7
Dependent Claim
21 words
The surface mountable electrical resistor as described in claim 1, wherein the pattern provides an inductance canceling effect to the resistor.
Claim 8
Dependent Claim
25 words
The surface mountable electrical resistor as described in claim 1, wherein the metal stamping has four legs, one leg at each corner of the stamping.
Claim 9
Dependent Claim
23 words
The surface mountable electrical resistor as described in claim 1, wherein the metal stamping is generally in the shape of an inverted "U".
Claim 10
Dependent Claim
73 words
A surface mountable electrical resistor, comprising an electrically resistive metal sheet formed generally in the shape of an inverted "U", the metal sheet having a primary resistive portion and at least two leg portions, each leg portion having a solderable mounting portion for attachment to a printed circuit board, the primary resistive portion having one or more openings formed in a major surface, the openings being shaped to minimize inductance in the resistor.
Claim 11
Dependent Claim
73 words
A surface mountable electrical resistor, comprising an electrically resistive metal sheet formed generally in the shape of an inverted "U", the metal sheet having a primary resistive portion and at least two leg portions, each leg portion having a solderable mounting portion for attachment to a printed circuit board, the primary resistive portion having one or more openings formed in a major surface, the openings being shaped to minimize inductance in the resistor.
Claim 12
Dependent Claim
25 words
The surface mountable electrical resistor as described in claim 9, wherein the openings formed in the major surface comprise one or more squared spiral patterns.
Claim 13
Dependent Claim
31 words
The surface mountable electrical resistor as described in claim 9, wherein the openings formed in the major surface comprise one or more patterns formed generally in the shape of a "S".
Claim 14
Dependent Claim
18 words
The surface mountable electrical resistor as described in claim 11, wherein the pattern comprises two complimentary spiral patterns.
Claim 15
Dependent Claim
33 words
The surface mountable electrical resistor as described in claim 9, wherein the metal sheet is selected from the group consisting of nichrome, steel, copper, chrome, stainless steel, alloy 42, nickel, constantan, and kovar.
Claim 16
Dependent Claim
25 words
The surface mountable electrical resistor as described in claim 9, wherein the metal sheet has four legs, one leg at each corner of the stamping.
Claim 17
Dependent Claim
83 words
A surface mountable electrical resistor, comprising a nichrome strip formed generally in the shape of an inverted "U", the nichrome strip having a primary resistive portion and four legs substantially perpendicular to the resistive portion, each leg having a solderable mounting portion for attachment to a printed circuit board, the primary resistive portion having a solid portion at a center and one or more openings formed in a major surface, the openings being shaped and arranged to produce inductive canceling of the resistor.
Claim 18
Dependent Claim
83 words
A surface mountable electrical resistor, comprising a nichrome strip formed generally in the shape of an inverted "U", the nichrome strip having a primary resistive portion and four legs substantially perpendicular to the resistive portion, each leg having a solderable mounting portion for attachment to a printed circuit board, the primary resistive portion having a solid portion at a center and one or more openings formed in a major surface, the openings being shaped and arranged to produce inductive canceling of the resistor.
Claim 19
Dependent Claim
26 words
The surface mountable electrical resistor as described in claim 15, wherein the openings formed in the primary resistive portion comprise one or more squared spiral patterns.
Claim 20
Dependent Claim
20 words
The surface mountable electrical resistor as described in claim 16, wherein the squared spiral pattern comprises two complimentary spiral patterns.
Claim 21
Dependent Claim
32 words
The surface mountable electrical resistor as described in claim 15, wherein the openings formed in the primary resistive portion comprise one or more patterns formed generally in the shape of a "S".
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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) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |