US3357876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of strengthening a glass article by ion exchange
Assignee: PPG Industries Inc
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Filing: 1965-01-19
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Granted: 1967-12-12
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Expires: 1985-01-19
Abstract
No abstract record available.
Inventors
- 👤 Rinehart Dale Welling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:45
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/097; C03C21/00; C03C21/001; C03C21/002; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
IN A METHOD OF CHEMICALLY TEMPERING A GLSS ARTICLE BY INTRODUCTION THEREIN OF A LARGER ALKALI METAL BY ALKALI METAL ION EXCHANGE BELOW THE STRAIN POINT OF THE GLASS ARTICLE THE IMPROVEMENT COMPRISING, USING AS SAID GLASS ARTICLE A LITHIA-P2O5-ALUMINA-SILICA GLASS CONTAINING FROM ABOUT 1 TO 25 PERCENT BY WEIGHT P2O5 AND AN ALKALI METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF NA2O, K2O AND MIXTURES THEREOF.
Claim 2
Dependent Claim
67 words
IN A METHOD OF CHEMICALLY TEMPERING A GLSS ARTICLE BY INTRODUCTION THEREIN OF A LARGER ALKALI METAL BY ALKALI METAL ION EXCHANGE BELOW THE STRAIN POINT OF THE GLASS ARTICLE THE IMPROVEMENT COMPRISING, USING AS SAID GLASS ARTICLE A LITHIA-P2O5-ALUMINA-SILICA GLASS CONTAINING FROM ABOUT 1 TO 25 PERCENT BY WEIGHT P2O5 AND AN ALKALI METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF NA2O, K2O AND MIXTURES THEREOF.
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) | 1970-12-11 | 1971-06-12 | 1971-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-11 | 1975-06-12 | 1975-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-11 | 1979-06-12 | 1979-12-12 | $7700.00 | Window Closed / Lapsed |