Patent US3819973A successfully refreshed from Google Patents.
US3819973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent filament
Assignee: Individual
•
Filing: 1972-11-02
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Granted: 1974-06-25
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Expires: 1992-11-02
Abstract
Abstract An electroluminescent filament of at least two wires made of electrical conductors each having an electrically insulating covering over the surface is provided. The wires are placed in abutment and covered with a phosphorescent material and the total thickness of the filament is controlled. Helically wound wires are used wherein the distance between the helical loop centers is controlled for best performance.
Inventors
- 👤 A Hosford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:02
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/26
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
An electroluminescent filament comprising: at least two wires, each wire comprising an electrical conductor and an electrically insulating covering on the surface of the conductor, the wires being in abutting relation along their length, a phosphor coating overlying the wires, and the total thickness of the filament including the insulators covering the conductors being less than 10 mils.
Claim 2
Dependent Claim
58 words
An electroluminescent filament comprising: at least two wires, each wire comprising an electrical conductor and an electrically insulating covering on the surface of the conductor, the wires being in abutting relation along their length, a phosphor coating overlying the wires, and the total thickness of the filament including the insulators covering the conductors being less than 10 mils.
Claim 3
Dependent Claim
21 words
An electroluminescent filament in accordance with claim 1 wherein the total thickness of the filament is less than about 8 mils.
Claim 4
Dependent Claim
38 words
An electroluminescent filament in accordance with claim 1 wherein the total thickness of the filament including the phosphor coating, which is essentially all between the wires except where the wires are in abutment, is less than 10 mils.
Claim 5
Dependent Claim
17 words
An electroluminescent filament in accordance with claim 3 wherein the total thickness is less than 8 mils.
Claim 6
Dependent Claim
19 words
An electroluminescent filament as set forth in claim 1 wherein at least two wires are in parallel abutting relation.
Claim 7
Dependent Claim
17 words
An electroluminescent filament in accordance with claim 1 wherein the wires are interwound each upon the other.
Claim 8
Dependent Claim
37 words
An electroluminescent filament in accordance with claim 1 wherein at least one of the wires is helically wound around at least one of the other wires so that the wires are in abutting relation along their length.
Claim 9
Dependent Claim
41 words
An electroluminescent filament in accordance with claim 7 wherein the distance between centers of each loop of helically wound wire and the next adjacent loop of helically wound wire is in the range of about 6 mils to about 12 mils.
Claim 10
Dependent Claim
35 words
An electroluminescent filament in accordance with claim 8 wherein the total thickness of filament is less than about 8 mils and the distance between centers of each loop is about 7 to about 9 mils.
Claim 11
Dependent Claim
19 words
An electroluminescent filament in accordance with claim 1 including a light transparent coating overlying the wires and the phosphor.
Claim 12
Dependent Claim
108 words
An electroluminescent filament comprising: at least two wires, each wire comprising an electrical conductor and an electrically insulating coating on the surface, at least one of the wires being helically wound around one of the other wires so that the wires are in abutting relation along their length, a phosphor coating overlying the wires, the total thickness of the filament including the insulators covering the conductors and the phosphor coating being less than 10 mils, and the distance between centers of each loop of helically wound wire and the next adjacent loop of helically wound wire being in the range of about 6 mils to about 12 mils.
Claim 13
Dependent Claim
108 words
An electroluminescent filament comprising: at least two wires, each wire comprising an electrical conductor and an electrically insulating coating on the surface, at least one of the wires being helically wound around one of the other wires so that the wires are in abutting relation along their length, a phosphor coating overlying the wires, the total thickness of the filament including the insulators covering the conductors and the phosphor coating being less than 10 mils, and the distance between centers of each loop of helically wound wire and the next adjacent loop of helically wound wire being in the range of about 6 mils to about 12 mils.
Claim 14
Dependent Claim
38 words
An electroluminescent filament in accordance with claim 11 wherein the total thickness of the filament is in the range of about six to about nine mils and the distance between helically loops is about 7 to 9 mils.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |