US3628934A
Expired / Lapsed
US
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Temperature control of chemical tempering of solid glass or vitrocrystalline bodies
Assignee: AGC Glass Europe SA
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Filing: 1968-04-23
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Granted: 1971-12-21
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Expires: 1988-04-23
Abstract
Abstract A process and apparatus for improving the properties of materials which are chemically tempered by means of an ion diffusion process, the improvement being obtained by decreasing the temperature at which the process is carried out during the course of the ion diffusion operation, by at least 40* C.
Inventors
- 👤 Jean Duthoit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:45
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/002
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
15 words
A process as defined in claim 1 wherein the body is of a soda-lime glass.
Claim 2
Dependent Claim
18 words
A process as defined in claim 1 wherein the chemical tempering involves an exchange of alkali metal ions.
Claim 3
Dependent Claim
25 words
A process as defined in claim 3 wherein the ion exchange involves the replacement of sodium ions originally present in the body by potassium ions.
Claim 4
Dependent Claim
20 words
A process as defined in claim 4 wherein the medium includes, as at least one ingredient, a molten potassium salt.
Claim 5
Dependent Claim
49 words
A process as defined in claim 1 wherein the tempering is carried out by passing the body through a mass of the diffusion medium and said step of decreasing the temperature is carried out by decreasing the temperature of the medium along the path of movement of the body.
Claim 6
Dependent Claim
24 words
A process as defined in claim 6 wherein the body is a ribbon of drawn glass which is caused to pass through the medium.
Claim 7
Dependent Claim
28 words
A process as defined in claim 7 wherein the ribbon of glass is caused to pass continuously into the medium from the drawing zone of a glass-drawing machine.
Claim 8
Dependent Claim
26 words
A process as defined in claim 1 wherein the diffusion medium is in the form of a coating disposed on the body during the ion exchange.
Claim 9
Dependent Claim
46 words
A process as defined in claim 1 comprising the preliminary step of preheating the body before bringing it into contact with the medium, the medium with which the body is initially brought into contact being at the temperature at which the ion exchange is to commence.
Claim 10
Dependent Claim
19 words
A body of vitreous or vitrocrystalline material strengthened by being subjected to the process as defined in claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |