US3741739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of strengthening glass
Assignee: Kimble Glass Inc
•
Filing: 1970-07-07
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Granted: 1973-06-26
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Expires: 1990-07-07
Abstract
Abstract A METHOD FOR ELECTROCHEMICALLY TEMPERING AN ALKALI SILICATE GLASS ARTICLE BY AN ION EXCHANGE PROCESS WHEREIN LARGER ALKALI IONS FROM AN ELECTRICALLY CONDUCTIVE, GASEOUS MEDIUM ARE EXCHANGED FOR THE ALKALI IONS PRESENT IN THE SURFACE OF THE GLASS ARTICLE.
Inventors
- 👤 T Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:30
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/007
Claims Analysis
Total Claims: 0
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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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |