US3293016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing glass articles having a high mechanical strength
Assignee: US Philips Corp
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Filing: 1964-12-08
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Granted: 1966-12-20
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Expires: 1984-12-08
Abstract
No abstract record available.
Inventors
- 👤 Cornelissen Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:04
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A METHOD OF STRENGTHENING GLASS ARTICLES CONSISTING OF AN ALUMINOSILICATE OF AN ALKALI METAL SELECTED FROM THE GROUP CONSISTING OF SODIUM AND LITHIUM AND CONTAINING AT LEAST 5 MOL PERCENT OF AL2O3 AND AT MOST 20 MOL PERCENT OF OTHER GLASS-FORMING COMPONENTS COMPRISING THE STEP OF IMMERSING THE GLASS ARTICLES IN A BATH OF MOLTEN POTASSIUM NITRITE AT A TEMPERATURE BETWEEN 550* C. AND AT LEAST 75* C. LOWER THAN THE ANNEALING TEMPERATURE OF THE POTASSIUM NITRITE AT A TEMPERATURE BETWEEN 550* C. AND AT LEAST 75* C. LOWER THAN THE ANNEALING TEMPERATURE OF THE GLASS, SAID BATH CONTAINING A CONSTITUENT SELECTED FROM THE GROUP CONSISTING OF STANNIC OXIDE, TIN AND ALUMINUM.
Claim 2
Independent Claim
112 words
A METHOD OF STRENGTHENING GLASS ARTICLES CONSISTING OF AN ALUMINOSILICATE OF AN ALKALI METAL SELECTED FROM THE GROUP CONSISTING OF SODIUM AND LITHIUM AND CONTAINING AT LEAST 5 MOL PERCENT OF AL2O3 AND AT MOST 20 MOL PERCENT OF OTHER GLASS-FORMING COMPONENTS COMPRISING THE STEP OF IMMERSING THE GLASS ARTICLES IN A BATH OF MOLTEN POTASSIUM NITRITE AT A TEMPERATURE BETWEEN 550* C. AND AT LEAST 75* C. LOWER THAN THE ANNEALING TEMPERATURE OF THE POTASSIUM NITRITE AT A TEMPERATURE BETWEEN 550* C. AND AT LEAST 75* C. LOWER THAN THE ANNEALING TEMPERATURE OF THE GLASS, SAID BATH CONTAINING A CONSTITUENT SELECTED FROM THE GROUP CONSISTING OF STANNIC OXIDE, TIN AND ALUMINUM.
References Cited (Backward Citations)
US3218220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |