US3281225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing the durability of glassware
Assignee: OI Glass Inc
•
Filing: 1965-09-30
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Granted: 1966-10-25
•
Expires: 1985-09-30
Abstract
No abstract record available.
Inventors
- 👤 James J Hazdra
- 👤 Arthur S Gunderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:42
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A METHOD OF PREPARING A GLASS SURFACE OF REDUCED ALKALINITY BY REMOVING FROM THE SURFACE THE ALKALI METAL IONS WHICH COMPRISES CONTACTING THE GLASS SURFACE WITH AN EFFECTIVE AMOUNT OF AN ALKALI-METAL SULFUR OXIDE COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM PYROSULFATE, SODIUM BISULFATE, POTASSIUM BISULFATE, POTASSIUM PYROSULFATE, LITHIUM BISULATE AND LITHIUM PYRROSULFATE; SAID COMPOUND CHARACTERIZED AS A STABLE SOLID AT ROOM TEMPERATURE AND DECOMPOSES AT TEMPERATURES ABOVE 460* C. TO SULFUR TRIOXIDE AND A METAL SALT, AND HEATING SAID GLASS SURFACE IN CONTACT WITH THE ALKALI-METAL SULFUR OXIDE COMPOUND TO A TEMPERATURE ABOVE 460*C. AND BELOW THE MELTING POINT OF THE GLASS FOR A PERIOD SUFFICIENT TO FORM SULFUR TRIOXIDE WHICH REACTS WITH THE ALKALI METAL IONS IN THE SURFACE OF THE GLASS TO FORM WATER-SOLUBLE SALTS; SAID WATER-SOLUBLE SALTS SUBSEQUENTLY BEING REMOVED TO OBTAIN THE REDUCED ALKALINITY GLASS SURFACE.
Claim 2
Independent Claim
142 words
A METHOD OF PREPARING A GLASS SURFACE OF REDUCED ALKALINITY BY REMOVING FROM THE SURFACE THE ALKALI METAL IONS WHICH COMPRISES CONTACTING THE GLASS SURFACE WITH AN EFFECTIVE AMOUNT OF AN ALKALI-METAL SULFUR OXIDE COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM PYROSULFATE, SODIUM BISULFATE, POTASSIUM BISULFATE, POTASSIUM PYROSULFATE, LITHIUM BISULATE AND LITHIUM PYRROSULFATE; SAID COMPOUND CHARACTERIZED AS A STABLE SOLID AT ROOM TEMPERATURE AND DECOMPOSES AT TEMPERATURES ABOVE 460* C. TO SULFUR TRIOXIDE AND A METAL SALT, AND HEATING SAID GLASS SURFACE IN CONTACT WITH THE ALKALI-METAL SULFUR OXIDE COMPOUND TO A TEMPERATURE ABOVE 460*C. AND BELOW THE MELTING POINT OF THE GLASS FOR A PERIOD SUFFICIENT TO FORM SULFUR TRIOXIDE WHICH REACTS WITH THE ALKALI METAL IONS IN THE SURFACE OF THE GLASS TO FORM WATER-SOLUBLE SALTS; SAID WATER-SOLUBLE SALTS SUBSEQUENTLY BEING REMOVED TO OBTAIN THE REDUCED ALKALINITY GLASS SURFACE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |