US3947801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser-trimmed resistor
Assignee: RCA Corp
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Filing: 1975-01-23
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Granted: 1976-03-30
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Expires: 1995-01-23
Abstract
Abstract A laser-trimmed film resistor wherein the laser kerf terminates in an area outside the electrical current path across the resistor.
Inventors
- 👤 Kenneth Roger Bube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:11
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/22; H01C17/24; H01C17/242; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
58 words
A film resistor comprising a resistive material disposed between conductive means, said resistive material containing one or more kerfs defining the path for an electrical current in said resistive material, said kerf having one end at an edge of the resistive material and a second end terminating in an area outside and away from said electrical current path.
Claim 2
Dependent Claim
58 words
A film resistor comprising a resistive material disposed between conductive means, said resistive material containing one or more kerfs defining the path for an electrical current in said resistive material, said kerf having one end at an edge of the resistive material and a second end terminating in an area outside and away from said electrical current path.
Claim 3
Dependent Claim
52 words
A resistor according to claim 1 wherein said kerf originates on a side of said resistor substantially parallel to said electrical current path, extends substantially perpendicular to said electrical current path, reflexes substantially parallel to said electrical current path, and terminates in an area outside and away from said electrical current path.
Claim 4
Dependent Claim
28 words
The resistor according to claim 2 wherein said kerf reflexes substantially perpencidular to and away from said current path following said reflex substantially parallel to said current path.
Claim 5
Dependent Claim
17 words
A resistor according to claim 3 wherein said kerf terminates on said originating side of said resistor.
Claim 6
Dependent Claim
16 words
A resistor according to claim 1 wherein said resistive material is disposed on an insulating substrate.
Claim 7
Dependent Claim
61 words
In a method for trimming a film resistor having an electrical current path there accross by forming one or more kerfs in said resistor with a laser beam, the improvement comprising forming the kerf by starting the kerf at an edge of the film resistor and terminating said laser kerf in an area outside and away from said electrical current path.
Claim 8
Dependent Claim
61 words
In a method for trimming a film resistor having an electrical current path there accross by forming one or more kerfs in said resistor with a laser beam, the improvement comprising forming the kerf by starting the kerf at an edge of the film resistor and terminating said laser kerf in an area outside and away from said electrical current path.
References Cited (Backward Citations)
US2597674A
Cited
US3573703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |