US3218220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strengthened glass article and method of producing same
Assignee: OI Glass Inc
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Filing: 1964-11-20
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Granted: 1965-11-16
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Expires: 1984-11-20
Abstract
No abstract record available.
Inventors
- 👤 Weber Neill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:28
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/002; C03C21/003; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A METHOD OF TEMPERING SODA GLASS COMPRISING REPLACING SODIUM IONS IN A SURFACE LAYER OF THE GLASS BY POTASSIUM IONS BY CONTACTING THE GLASS WITH A MOLTEN POTASSIUM SALT WHILE RETAINING THE GLASS BELOW THE STRAIN TEMPERATURE THEREOF TO PLACE THE SURFACE IN COMPRESSION.
Claim 2
Dependent Claim
97 words
A GLASS ARTICLE OF IMPROVED STRENGTH CONTAINING IONS OF AT LEAST TWO ALKALI-METALS OF DIFFERENT SIZE AND HAVING A SURFACE COMPRESSIVE STRESS LAYER AND ANINTERIOR TENSILE STRESS LAYER, IN WHICH THE GLASS OF THE SURFACE LAYER HAS A GREATER MOLAR VOLUME IN THE UNCONSTRAINED STATE THAN THE GLASS OF THE INTERIOR LAYER, THE CONCENTRATION OF THE LARGER ALKALI-METAL ION BEING GREATER IN SAID SURFACE LAYER THAN IN SAID INTERIOR LAYER, AND THE CONCENTRATION OF THE SMALLER ALKALI-METAL ION BEING GREATER IN SAID INTERIOR LAYER THAN IN SAID SURFACE LAYER, SAID DIFFERENCE IN CONCENTRATION CREATING SAID COMPRESSIVE STRESS.
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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |