US5142184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold cathode field emission device with integral emitter ballasting
Assignee: Motorola Solutions Inc
•
Filing: 1990-02-09
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Granted: 1992-08-25
•
Expires: 2010-02-09
Abstract
Abstract A cold cathode field emission device that includes a ballast resistor (202, 303, 402) integrally formed therewith and coupled to the emitter (204, 302, 403) to allow appropriate compensation for manufacturing and performance variations in field emission from the attached emitter.
Inventors
- 👤 Robert C. Kane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:01
CPC Classifications
H; H01; H01J; H01J7/00; H01J7/44; H01J3/00; H01J3/02; H01J3/021; H01J3/022; H01J2201/00; H01J2201/30; H01J2201/319
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
22 words
A cold-cathode field emission device having an anode, an emitter, and a ballast resistor formed integrally therewith and coupled to the emitter.
Claim 2
Dependent Claim
22 words
A cold-cathode field emission device having an anode, an emitter, and a ballast resistor formed integrally therewith and coupled to the emitter.
Claim 3
Dependent Claim
17 words
The device of claim 1 wherein the emitter couples through the ballast resistor to a voltage source.
Claim 4
Dependent Claim
29 words
The device of claim 1 wherein the device is formed on a semiconductor substrate, and wherein the ballast resistor is formed, at least in part, of the semiconductor substrate.
Claim 5
Dependent Claim
23 words
The device of claim 3 wherein the ballast resistor is formed, at least in part, through selective impurity diffusion of the semiconductor substrate.
Claim 6
Dependent Claim
13 words
The device of claim 4 wherein the selective impurity diffusion includes phosphorous material.
Claim 7
Dependent Claim
15 words
The device of claim 1 wherein the field emission device has a substantially planar geometry.
Claim 8
Dependent Claim
15 words
The device of claim 1 wherein the field emission device has a substantially non-planar geometry.
Claim 9
Dependent Claim
32 words
An electronic device having a plurality of cold-cathode field emission devices, each of these devices having an anode, an emitter, and a ballast resistor formed integrally therewith and coupled to the emitter.
Claim 10
Dependent Claim
32 words
An electronic device having a plurality of cold-cathode field emission devices, each of these devices having an anode, an emitter, and a ballast resistor formed integrally therewith and coupled to the emitter.
Claim 11
Independent Claim
74 words
A method of forming a cold-cathode field emission device having a ballast resistor coupled to an emitter thereof, comprising the steps of: A) providing a semiconductor substrate; B) forming the ballast resistor by selectively diffusing impurities in at least a part of the semiconductor substrate; C) forming at least part of the cold-cathode field emission device on the semiconductor substrate such that an emitter thereof couples to the ballast resistor; D) forming an anode.
Claim 12
Independent Claim
74 words
A method of forming a cold-cathode field emission device having a ballast resistor coupled to an emitter thereof, comprising the steps of: A) providing a semiconductor substrate; B) forming the ballast resistor by selectively diffusing impurities in at least a part of the semiconductor substrate; C) forming at least part of the cold-cathode field emission device on the semiconductor substrate such that an emitter thereof couples to the ballast resistor; D) forming an anode.
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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) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |