US3615322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical strengthening of glass articles produced with flame treatment
Assignee: Anchor Hocking Glass Corp
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Filing: 1968-09-30
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Granted: 1971-10-26
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Expires: 1988-09-30
Abstract
Abstract In the production of glass articles formed by a process including a flame treating step, and which are to be strengthened by ion exchange, much greater strength improvements can be obtained if alkali ions in the article are first exchanged with ions from an external source, and the article is thereafter subjected to the flame treatment rather than completing the flame treating step before ion exchange. The process has especially useful application in the production of blown soda-lime tumblers and similarly formed articles wherein a moil is cracked off leaving an edge requiring fire polishing and which is to be strengthened by an ion exchange technique.
Inventors
- 👤 Burton S Bogart
- 👤 Paul D Dilliard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:04
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
14 words
The method of claim 1 wherein said article is flame treated by fire polishing.
Claim 2
Dependent Claim
29 words
The method of claim 2 wherein said article is formed of a glass composition including about 45 to 80 percent by weight SiO2 and 7 to 25 percent Na2O.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said composition is a soda-lime glass.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein said article is formed by blowing and said area is a rim edge presented by cracking off a moil.
Claim 5
Dependent Claim
36 words
The method of claim 1 wherein said external source of metal ions is cuprous iodide and the reaction product of the exchange is vaporized from said area without intermediate cooling between said exchanging and flame treating.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein said metal ions are in the vapor state.
Claim 7
Dependent Claim
26 words
The method of claim 1 wherein said article is transferred from an ion exchange treating zone to flame treating apparatus, without intervening cooliNg to room temperature.
Claim 8
Dependent Claim
45 words
The method of claim 1 wherein said article is a blown tumbler having the composition, about 65-75 percent by weight SiO2, 14-17 Na2O, 7-12 percent (CaO + MgO) and up to about 3 percent Al2O3, and wherein said tumbler said tumbler has a crack-off edge.
Claim 9
Independent Claim
86 words
The method of producing blown soda-lime tumblers comprising, blowing the tumbler with a moil attached to it, cracking off the moil thereby leaving an edge requiring fire polishing, strengthening said article by exposing side edge to a vaporized cuprous halogen compound at a temperature above the annealing point of the glass such that copper ions from said compound migrate into and partially replace sodium ions in said article adjacent said edge, then subjecting said edge to fire polishing after the ion exchange step has taken place.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |