Patent US4582976A successfully refreshed from Google Patents.
US4582976A
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Method of adjusting a temperature compensating resistor while it is in a circuit
Assignee: HP Inc
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Filing: 1984-08-13
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Granted: 1986-04-15
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Expires: 2004-08-13
Abstract
Abstract A method of providing a temperature compensating resistor having a desired ohmic change with temperature comprising the steps of connecting a resistor R T that is made of material having a high temperature coefficient in parallel with a resistor R S that is made of material having a lower temperature coefficient, connecting the parallel combination in a circuit and increasing the value of R S by cutting it with a laser until the circuit indicates that the desired result is obtained.
Inventors
- 👤 Edwin B. Merrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:25
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/22; H01C17/232; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
A method of making a resistor having a resistance that changes by an adjustable amount for a change of one degree in temperature, comprising connecting a resistor RT having a given temperature coefficient in parallel with a resistor RS having a lower temperature coefficient, and increasing the resistance of RS until the temperature coefficient of the parallel combination reaches the desired value.
Claim 2
Independent Claim
62 words
A method of making a resistor having a resistance that changes by an adjustable amount for a change of one degree in temperature, comprising connecting a resistor RT having a given temperature coefficient in parallel with a resistor RS having a lower temperature coefficient, and increasing the resistance of RS until the temperature coefficient of the parallel combination reaches the desired value.
Claim 3
Dependent Claim
21 words
A method as set forth in claim 1 wherein the resistance of RS is increased by means that raise its temperature.
Claim 4
Dependent Claim
22 words
A method as set forth in claim 1 wherein the resistance of RS is increased by reducing its cross-section with a laser.
References Cited (Backward Citations)
US3649801A
Cited
US4041440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |