US3984697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona generator
Assignee: Atlantic Richfield Co
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Filing: 1975-03-19
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Granted: 1976-10-05
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Expires: 1995-03-19
Abstract
Abstract A corona generator method and apparatus preferably for generating ozone, employing a plurality of corona generating cells each comprising a pair of parallel spaced-apart electrodes having a fired-on coating of porcelain enamel. The electrodes are connected to an AC voltage source of sufficient voltage to generate a corona discharge, and an oxygen-containing gas is passed between the electrodes to generate ozone. A high concentration ozone is produced as well as a large quantity of ozone, without water cooling, and at voltages of approximately 6,000 volts. An equation setting forth, for the first time, the interrelationships between the various parameters in a corona generator is derived by Applicant. According to the invention, the corona power is maximized by maximizing the expression ε/Td, where epsilon is the dielectric constant of the porcelain enamel coating and Td is the dielectric thickness.
Inventors
- 👤 Frank E. Lowther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:25
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/10; C01B13/11; B; B01; B01J; B01J2219/00; B01J2219/08; B01J2219/0803; B01J2219/0805; B01J2219/0845; B01J2219/0849
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
79 words
In a corona generator including a pair of spaced-apart, adjacent electrodes defining a corona discharge chamber between facing interior surfaces of said electrodes, the improvement wherein at least one of said electrodes has a metal electrode substrate having a thin, hard, fired-on coating of porcelain enamel having a thickness of less than 20 mils and being fired onto an interior surface thereof at a temperature sufficiently high to bond said porcelain enamel coating onto said surface of said electrode.
Claim 2
Dependent Claim
79 words
In a corona generator including a pair of spaced-apart, adjacent electrodes defining a corona discharge chamber between facing interior surfaces of said electrodes, the improvement wherein at least one of said electrodes has a metal electrode substrate having a thin, hard, fired-on coating of porcelain enamel having a thickness of less than 20 mils and being fired onto an interior surface thereof at a temperature sufficiently high to bond said porcelain enamel coating onto said surface of said electrode.
Claim 3
Dependent Claim
21 words
The corona generator according to claim 1 wherein said coating comprises a plurality of separately fired-on individual layers of porcelain enamel.
Claim 4
Dependent Claim
18 words
The apparatus according to claim 2 wherein said coating is fired-on at a temperature of about 1500° F.
Claim 5
Dependent Claim
17 words
The apparatus according to claim 3 wherein said coating has a dielectric constant of at least 5.
Claim 6
Dependent Claim
26 words
The apparatus according to claim 4 wherein said substrate and said coating each have a constant thickness and wherein said coating has a flat, smooth surface.
Claim 7
Dependent Claim
18 words
The apparatus according to claim 5 wherein said substrate is flat over a major portion of its area.
Claim 8
Dependent Claim
21 words
The apparatus according to claim 6 wherein said surface of said substrate is etched prior to said coating being fired thereon.
Claim 9
Dependent Claim
23 words
The apparatus according to claim 7 wherein said porcelain enamel has a high softening point temperature at least equal to that of glass.
Claim 10
Dependent Claim
38 words
The apparatus according to claim 8 wherein the total dielectric thickness Td in mils of said coating, and the dielectric constant ε of said p.e. are such that the value of the expression ε/Td is greater than 0.1.
Claim 11
Dependent Claim
16 words
The apparatus according to claim 9 wherein said coating is uniform and is free of voids.
Claim 12
Dependent Claim
14 words
The apparatus according to claim 10 wherein said coating is free of conductive particles.
Claim 13
Dependent Claim
17 words
The apparatus according to claim 1 wherein said coating has a dielectric constant of at least 5.
Claim 14
Dependent Claim
26 words
The apparatus according to claim 1 wherein said substrate and said coating each have a constant thickness and wherein said coating has a flat, smooth surface.
Claim 15
Dependent Claim
18 words
The apparatus according to claim 1 wherein said substrate is flat over a major portion of its area.
Claim 16
Dependent Claim
18 words
The apparatus according to claim 1 wherein said coating is fired-on at a temperature of about 1500° F.
Claim 17
Dependent Claim
21 words
The apparatus according to claim 1 wherein said surface of said substrate is etched prior to said coating being fired thereon.
Claim 18
Dependent Claim
16 words
The apparatus according to claim 1 wherein said coating is uniform and is free of voids.
Claim 19
Dependent Claim
14 words
The apparatus according to claim 1 wherein said coating is free of conductive particles.
Claim 20
Dependent Claim
23 words
The apparatus according to claim 1 wherein said porcelain enamel has a high softening point temperature at least equal to that of glass.
Claim 21
Dependent Claim
38 words
The apparatus according to claim 1 wherein the total dielectric thickness Td in mils of said coating, and the dielectric constant ε of said p.e. are such that the value of the expression ε/Td is greater than 0.1.
Claim 22
Dependent Claim
17 words
The apparatus according to claim 1 wherein said at least one electrode comprises both of said electrodes.
Claim 23
Dependent Claim
38 words
The apparatus according to claim 21 wherein said coatings comprise a plurality of separately fired-on individual porcelain enamel layers, and said electrodes are made of etched, decarbonized steel, on which said coatings are fired at about 1500° F.
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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) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |