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Patent US4126824A successfully refreshed from Google Patents.
US4126824A
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Progressively shorted tapered resistance device
Assignee: Xerox Corp
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Filing: 1977-04-21
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Granted: 1978-11-21
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Expires: 1997-04-21
Abstract
Abstract A progressively shorted tapered resistance device including a body of material which undergoes an irreversible resistance decrease when heated beyond a threshold temperature in operative association with a tapered electrical resistance element which develops a non-uniform temperature profile when electrically energized. Upon sufficient energization, the tapered resistor element will cause portions of the heat sensitive material to be heated beyond its threshold temperature resulting in a shorting out of a portion of the tapered resistance element. The amount of the tapered resistance element shorted out is measured at low currents to provide an indication of the energizing current.
Inventors
- 👤 David D. Thornburg
- 👤 Roy J. Lahr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:15
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/20; H01C1/00; H01C1/08; H01C1/084; H01P; H01P1/00; H01P1/22; H01P1/227
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
79 words
A tapered resistor device comprising: a tapered, electrically resistive element which develops a non-uniform temperature profile on electrical energization, and a body of a material which undergoes an irreversible resistance change when heated above a threshold temperature, said body of material being in operative association with said tapered resistive element whereby heat produced by said tapered resistive element is operable to change the resistance of at least a portion of said body of material heated above said threshold temperature.
Claim 2
Dependent Claim
79 words
A tapered resistor device comprising: a tapered, electrically resistive element which develops a non-uniform temperature profile on electrical energization, and a body of a material which undergoes an irreversible resistance change when heated above a threshold temperature, said body of material being in operative association with said tapered resistive element whereby heat produced by said tapered resistive element is operable to change the resistance of at least a portion of said body of material heated above said threshold temperature.
Claim 3
Dependent Claim
21 words
The device of claim 1 wherein said body of material undergoes an irreversible resistance decrease when heated above a threshold temperatue.
Claim 4
Dependent Claim
18 words
The device of claim 1 further including means for detecting any resistance change of said tapered resistive element.
Claim 5
Dependent Claim
14 words
The device of claim 1 wherein the taper of said resistive element is linear.
Claim 6
Dependent Claim
14 words
The device of claim 1 wherein said tapered resistive element has a stepped configuration.
Claim 7
Dependent Claim
38 words
The device of claim 1 wherein a layer of electrically insulating material is interposed between said tapered resistive element and said body of material, and means are provided for measuring any resistance change of said body of material.
Claim 8
Dependent Claim
35 words
The device of claim 1 wherein said tapered resistive element has tabs distributed along its length, and means for providing electrical contact to said tapered resistive element at at least some points between said tabs.
Claim 9
Dependent Claim
17 words
The device of claim 1 wherein said tapered resistive element is supported by an electrically insulating substrate.
Claim 10
Dependent Claim
14 words
The device of claim 1 wherein said body of material is a chalcogenide glass.
Claim 11
Dependent Claim
14 words
The device of claim 2 wherein said body of material is a chalcogenide glass.
Claim 12
Dependent Claim
38 words
The device of claim 1 wherein a layer of electrically insulating material is interposed between said tapered resistive element and said body of material, and a layer of electrically resistive material is deposited on said body of material.
Claim 13
Dependent Claim
65 words
A tapered resistor device comprising a tapered resistive element which develops a non-uniform temperature profile on electrical energization, a heat sensitive resistive material along the length of and in operative association with said tapered resistive element and responsive to heat above a given threshold temperature developed by said resistive element to undergo an irreversible resistance change thereby changing the overall resistance value of the device.
Claim 14
Dependent Claim
65 words
A tapered resistor device comprising a tapered resistive element which develops a non-uniform temperature profile on electrical energization, a heat sensitive resistive material along the length of and in operative association with said tapered resistive element and responsive to heat above a given threshold temperature developed by said resistive element to undergo an irreversible resistance change thereby changing the overall resistance value of the device.
Claim 15
Dependent Claim
34 words
The device of claim 12, wherein said tapered resistive element and said heat sensitive resistive material are divided into a plurality of tapered segments and means to detect the resistance change of each segment.
Claim 16
Dependent Claim
49 words
The device of claim 13, wherein said tapered segments are defined by a plurality of tabs extending outwardly along at least one length of said tapered resistive element and said heat sensitive resistive material, said detection means connected to said resistive element at said tapered segments between said tabs.
Claim 17
Dependent Claim
43 words
The device of claim 12 wherein the resistance change of said heat sensitive resistive material is toward a conductive state and the amount of said change along its length is dependent upon the value of electrical energization applied to said tapered resistive element.
References Cited (Backward Citations)
US2755457A
Cited
US3149281A
Cited
US3244979A
Cited
US3524726A
Cited
GB1318007A
Cited
US4006414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |