Patent US4227234A successfully refreshed from Google Patents.
US4227234A
Expired / Lapsed
US
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Corona charging element
Assignee: Xerox Corp
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Filing: 1978-07-03
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Granted: 1980-10-07
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Expires: 1998-07-03
Abstract
Abstract Corona discharge electrodes are coated with compressed dielectric materials. A corona discharge electrode is placed under tension and coated with a molten, viscous dielectric material, such as glass, while under tension. The dielectric material is allowed to cool so that the dielectric material becomes bonded securely to the corona discharge electrode. The tension upon the corona discharge electrode is released thereby causing a compression of the dielectric material adhered thereto. The resulting dielectric coated corona discharge electrode has a substantially improved life and delivers substantially uniform currents.
Inventors
- 👤 Donald A. Seanor
- 👤 Judy P. Nagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:30
CPC Classifications
H; H01; H01T; H01T19/00
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
71 words
An improved corona discharge member of the type having an inner conductive electrode and an outer dielectric coating made by the process comprising applying tension to the inner conductive electrode; depositing a dielectric material adhering the dielectric material to the inner conductive electrode at the interface of the inner conductive electrode and the dielectric material; and releasing the tension on the inner conductive electrode thereby causing compression of the dielectric material.
Claim 2
Dependent Claim
71 words
An improved corona discharge member of the type having an inner conductive electrode and an outer dielectric coating made by the process comprising applying tension to the inner conductive electrode; depositing a dielectric material adhering the dielectric material to the inner conductive electrode at the interface of the inner conductive electrode and the dielectric material; and releasing the tension on the inner conductive electrode thereby causing compression of the dielectric material.
Claim 3
Dependent Claim
87 words
An improved corona discharge member of the type having an inner conductive electrode and an outer dielectric coating made by the process comprising applying stress to the inner conductive electrode; coating the inner conductive electrode with a dielectric coating capable of being compressed, said dielectric being in a molten state; cooling the dielectric after it has wet the surface of the inner conductive electrode; and releasing the stress on the inner conductive electrode, whereby the inner conductive electrode contracts causing a compression of the outer dielectric coating.
Claim 4
Dependent Claim
87 words
An improved corona discharge member of the type having an inner conductive electrode and an outer dielectric coating made by the process comprising applying stress to the inner conductive electrode; coating the inner conductive electrode with a dielectric coating capable of being compressed, said dielectric being in a molten state; cooling the dielectric after it has wet the surface of the inner conductive electrode; and releasing the stress on the inner conductive electrode, whereby the inner conductive electrode contracts causing a compression of the outer dielectric coating.
Claim 5
Dependent Claim
15 words
The improved corona discharge member of claim 2 wherein the dielectric coating is compressed glass.
Claim 6
Dependent Claim
15 words
The improved corona discharge member of claim 2 wherein the dielectric coating is compressed ceramic.
Claim 7
Dependent Claim
20 words
The improved corona discharge member of claim 2 wherein the inner conductive electrode to which stress is applied, is tungsten.
Claim 8
Dependent Claim
20 words
The improved corona discharge member of claim 2 wherein the inner conductive electrode to which stress is applied, is molybdenum.
Claim 9
Dependent Claim
26 words
The improved corona discharge member of claim 2 wherein the stress is applied to the inner conductive electrode is between about 50 grams and 1,000 grams.
Claim 10
Dependent Claim
26 words
The improved corona discharge member of claim 2 wherein the stress applied to the inner conductive electrode is between about 150 grams and about 500 grams.
Claim 11
Dependent Claim
28 words
The improved corona discharge device of claim 2 wherein the dielectric is applied to the inner conductive electrode at a temperature of between 700° C. and 1,200° C.
Claim 12
Dependent Claim
28 words
The improved corona discharge device of claim 2 wherein the dielectric is applied to the inner conductive electrode at a temperature of between 975° C. and 1,050° C.
Claim 13
Dependent Claim
30 words
The improved corona discharge device of claim 2 wherein the dielectric is applied to the inner conductive electrode at a viscosity of between about 10 4 and 10 7 poise.
Claim 14
Dependent Claim
42 words
The improved corona discharge device of claim 2 wherein the compression of the outer dielectric coating after the stress on the inner conductive electrode is released, is about 500 p.s.i. (35 kg/cm 2 ) to about 20,000 p.s.i. (1,400 kg/cm 2 ).
Claim 15
Dependent Claim
42 words
The improved corona discharge device of claim 2 wherein the compression of the outer dielectric coating after the stress on the inner conductive electrode is released, is about 8,000 p.s.i. (560 kg/cm 2 ) to about 12,000 p.s.i. (840 kg/cm 2 ).
Claim 16
Independent Claim
118 words
A method of making a coated corona discharge member of the type having an inner conductive electrode and an outer dielectric coating comprising: (a) applying stress to the inner conductive electrode; (b) coating the inner conductive electrode with a dielectric coating capable of being compressed, the dielectric being in a molten state; (c) cooling the dielectric after it has wet the surface of the inner conductive electrode to a temperature at which the dielectric becomes securely bonded to the inner conductive electrode; and (d) releasing the stress on the inner conductive electrode whereby the inner conductive electrode contracts causing a compression of the outer dielectric coating while the outer dielectric coating remains bonded to the inner conductive electrode.
Claim 17
Independent Claim
118 words
A method of making a coated corona discharge member of the type having an inner conductive electrode and an outer dielectric coating comprising: (a) applying stress to the inner conductive electrode; (b) coating the inner conductive electrode with a dielectric coating capable of being compressed, the dielectric being in a molten state; (c) cooling the dielectric after it has wet the surface of the inner conductive electrode to a temperature at which the dielectric becomes securely bonded to the inner conductive electrode; and (d) releasing the stress on the inner conductive electrode whereby the inner conductive electrode contracts causing a compression of the outer dielectric coating while the outer dielectric coating remains bonded to the inner conductive electrode.
Claim 18
Dependent Claim
23 words
The method of claim 14 wherein the inner conductive electrode is coated with about 0.045 mm. to about 0.254 mm. of the dielectric.
Claim 19
Dependent Claim
12 words
The method of claim 14 wherein the dielectric coating is compressed glass.
Claim 20
Dependent Claim
12 words
The method of claim 14 wherein the dielectric coating is compressed ceramic.
Claim 21
Dependent Claim
18 words
The method of claim 14 wherein the inner conductive electrode to which stress is applied, is tungsten wire.
Claim 22
Dependent Claim
15 words
The method of claim 14 wherein the inner conductive electrode is applied, is molybdenum wire.
Claim 23
Dependent Claim
40 words
The method of claim 14 wherein the stress applied to the inner conductive electrode prior to and during the coating thereof is about 15 grams up to within about 0.5 gram of the breaking point of the inner conductive electrode.
Claim 24
Dependent Claim
29 words
The method of claim 14 wherein the stress applied to the inner conductive electrode prior to and during the coating thereof is about 50 grams to about 500 grams.
Claim 25
Dependent Claim
20 words
The method of claim 14 wherein the dielectric is heated at a temperature sufficient to induce a molten state therein.
Claim 26
Dependent Claim
26 words
The method of claim 14 wherein the dielectric is heated at a temperature of about 700° C. to about 1,200° C. to induce the molten state.
Claim 27
Dependent Claim
21 words
The method of claim 14 wherein the dielectric is heated at a temperature of about 975° C. to about 1,050° C.
Claim 28
Dependent Claim
28 words
The method of claim 15 wherein the dielectric is coated upon the inner conductive electrode at a viscosity of between about 10 4 to about 10 7 poise.
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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) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |