US3287201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of strengthening glass by ion exchange and article made therefrom
Assignee: PPG Industries Inc
•
Filing: 1963-01-07
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Granted: 1966-11-22
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Expires: 1983-01-07
Abstract
No abstract record available.
Inventors
- 👤 Raymond S Chisholm
- 👤 George E Sleighter
- 👤 Fred M Ernsberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:38
CPC Classifications
C; C03; C03C; C03C21/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 words
A METHOD OF STRENGTHENING AN ALKALI METAL CONTAINING GLASS WHICH COMPRISES REPLACING THE ALKALI METAL IONS IN A SURFACE OF THE GLASS BY SMALLER ELECTROPOSITIVE METAL IONS SELECTED FROM THE GROUP CONSISTING OF THE IONS OF ALKALI METALS, COOPER, SILVER AND HYDROGEN BY CONTACTING THE GLASS WITH A SOURCE OF SAID SMALLER ELECTROPOSITIVE METAL IONS WHILE RETAINING THE GLASS AT A TEMPERATURE ABOVE THE STRAIN POINT OF THE GLASS, REDUCING THE TEMPERATURE OF THE GLASS BELOW THE STRAIN POOINT AFTER SAID REPLACEMEN, AND THEREAFTER REPLACING SAID SMALLER ELECTROPOSITIVE METAL IONS WITH LARGER ELECTROPOSITIVE METAL IONS SELECTED FROM THE GROUP CONSISTING OF THE IONS OF ALKALI METALS, COPPER AND SILVER BY CONTACTING THE GLASS WITH A SORUCE OF SAID LARGER ELECTROPOSITIVE METAL IONS WHILE RETAINING THE TEMPERATURE OF THE GLASS BELOW THE STRAIN POINT OF THE GLASS UNTIL THE SURFACE IS PLACED IN COMPRESSION BY SAID LATTER REPLACEMENT.
Claim 2
Independent Claim
147 words
A METHOD OF STRENGTHENING AN ALKALI METAL CONTAINING GLASS WHICH COMPRISES REPLACING THE ALKALI METAL IONS IN A SURFACE OF THE GLASS BY SMALLER ELECTROPOSITIVE METAL IONS SELECTED FROM THE GROUP CONSISTING OF THE IONS OF ALKALI METALS, COOPER, SILVER AND HYDROGEN BY CONTACTING THE GLASS WITH A SOURCE OF SAID SMALLER ELECTROPOSITIVE METAL IONS WHILE RETAINING THE GLASS AT A TEMPERATURE ABOVE THE STRAIN POINT OF THE GLASS, REDUCING THE TEMPERATURE OF THE GLASS BELOW THE STRAIN POOINT AFTER SAID REPLACEMEN, AND THEREAFTER REPLACING SAID SMALLER ELECTROPOSITIVE METAL IONS WITH LARGER ELECTROPOSITIVE METAL IONS SELECTED FROM THE GROUP CONSISTING OF THE IONS OF ALKALI METALS, COPPER AND SILVER BY CONTACTING THE GLASS WITH A SORUCE OF SAID LARGER ELECTROPOSITIVE METAL IONS WHILE RETAINING THE TEMPERATURE OF THE GLASS BELOW THE STRAIN POINT OF THE GLASS UNTIL THE SURFACE IS PLACED IN COMPRESSION BY SAID LATTER REPLACEMENT.
Claim 3
Dependent Claim
18 words
A STRENGTHENED GLASS ARTICLE HAVING A STRESS PATTERN SUBSTANTIALLY AS SHOWN IN THE SINGLE FIGURE IN THE DRAWING.
Claim 4
Dependent Claim
18 words
A STRENGTHENED GLASS ARTICLE HAVING A STRESS PATTERN SUBSTANTIALLY AS SHOWN IN THE SINGLE FIGURE IN THE DRAWING.
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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |