Patent US3879183A successfully refreshed from Google Patents.
US3879183A
Expired / Lapsed
US
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Corona discharge method of depleting mobile ions from a glass region
Assignee: RCA Corp
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Filing: 1973-08-15
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Granted: 1975-04-22
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Expires: 1993-08-15
Abstract
Abstract A method of depleting a surface region of a glass body of mobile positive ions, comprising subjecting the body to a corona discharge using an anode and a cathode disposed adjacent opposite surfaces of the body, while heating the body to a temperature below the deformation temperature of the glass. The discharge may be either in a low vacuum or at ordinary atmospheric pressure.
Inventors
- 👤 David Emil Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:04
CPC Classifications
C; C03; C03C; C03C23/00; C03C21/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A method of depleting mobile alkali metal ions from a surface region of a glass body comprising disposing opposite surfaces of said body between but not physically contacting anode and cathode electrodes, and establishing a corona discharge between at least one of said electrodes and said body, while heating said body at a temperature less than the deformation temperature of the glass for a time sufficient to cause alkali metal ions on the side of the body adjacent the anode to migrate toward the cathode without the introduction of other ions into the surface region.
Claim 2
Independent Claim
95 words
A method of depleting mobile alkali metal ions from a surface region of a glass body comprising disposing opposite surfaces of said body between but not physically contacting anode and cathode electrodes, and establishing a corona discharge between at least one of said electrodes and said body, while heating said body at a temperature less than the deformation temperature of the glass for a time sufficient to cause alkali metal ions on the side of the body adjacent the anode to migrate toward the cathode without the introduction of other ions into the surface region.
Claim 3
Dependent Claim
28 words
A method according to claim 1 in which the treatment takes place in a low vacuum of the order of about 10 2 to 10 mm of mercury.
Claim 4
Dependent Claim
28 words
A method according to claim 2 in which the type of glass being treated is a soda-lime-silicate glass and the treating temperature is greater than about 200* C.
Claim 5
Dependent Claim
23 words
A method according to claim 1 in which the treatment takes place at ordinary atmospheric pressure in an atmosphere of an electron-attaching gas.
Claim 6
Dependent Claim
19 words
A method according to claim 4 in which said electrodes are spaced about 1-30 mm from the glass surfaces.
Claim 7
Dependent Claim
13 words
A method according to claim 5 in which said electron-attaching gas is air.
References Cited (Backward Citations)
US2864755A
Cited
US3061458A
Cited
US3174919A
Cited
US3397132A
Cited
US3421930A
Cited
US3697303A
Cited
US3632386A
Cited
US3654108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |