Patent US2779136A successfully refreshed from Google Patents.
US2779136A
Expired / Lapsed
US
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Method of making a glass article of high mechanical strength and article made thereby
Assignee: Corning Glass Works
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Filing: 1955-07-06
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Granted: 1957-01-29
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Expires: 1975-07-06
Abstract
No abstract record available.
Inventors
- 👤 Harrison P Hood
- 👤 Stanley D Stookey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:18
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/002; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
THE METHOD OF MAKING A GLASS ARTICLE OF HIGH MECHANICAL STRENGTH WHICH COMPRISES PROVIDING AN ARTICLE OF GLASS CONTAINING 45% TO 80% SIO2 AND 7% TO 25% OF AT LEAST ONE ALKALI METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF NA2O AND K2O, CONTACTING THE ARTICLE WHILE AT A TEMPERATURE ABOVE ITS STRAIN POINT BUT BELOW ITS SOFTENING POINT WITH A LITHIUM SALT, WHICH WILL BE MOLTEN BUT WHICH WILL NOT DECOMPOSE OBJECTIONABLY AT SUCH TEMPERATURE, AND MAINTAINING THE ARTICLE IN CONTACT WITH THE SALT AT SAID TEMPERATURE FOR A TIME SUFFICIENT TO PERMIT LITHIUM IONS TO DIFFUSE INTO THE SURFACE OF THE GLASS IN EXCHANGE FOR ALKALI METAL IONS OF THE GLASS.
Claim 2
Independent Claim
113 words
THE METHOD OF MAKING A GLASS ARTICLE OF HIGH MECHANICAL STRENGTH WHICH COMPRISES PROVIDING AN ARTICLE OF GLASS CONTAINING 45% TO 80% SIO2 AND 7% TO 25% OF AT LEAST ONE ALKALI METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF NA2O AND K2O, CONTACTING THE ARTICLE WHILE AT A TEMPERATURE ABOVE ITS STRAIN POINT BUT BELOW ITS SOFTENING POINT WITH A LITHIUM SALT, WHICH WILL BE MOLTEN BUT WHICH WILL NOT DECOMPOSE OBJECTIONABLY AT SUCH TEMPERATURE, AND MAINTAINING THE ARTICLE IN CONTACT WITH THE SALT AT SAID TEMPERATURE FOR A TIME SUFFICIENT TO PERMIT LITHIUM IONS TO DIFFUSE INTO THE SURFACE OF THE GLASS IN EXCHANGE FOR ALKALI METAL IONS OF THE GLASS.
References Cited (Backward Citations)
US2428600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |