US3301649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making high strength glass articles
Assignee: Corning Glass Works
•
Filing: 1964-03-10
•
Granted: 1967-01-31
•
Expires: 1984-03-10
Abstract
No abstract record available.
Inventors
- 👤 Francis J Marusak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:03
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN THE METHOD FOR STRENGTHENING A POLISHING ALKALI SILICATE GLASS ARTICLE TO INCREASE ITS RESISTANCE TO IMPACT WHEREIN THE ALKALI IONS IN A SURFACE OF THEGLASS ARTICLE ARE REPLACED BY LARGER ALKALI METAL IONS AT AN ELEVATED TEMPERATURE BELOW THE GLASS ANNEALING RANGE, SUCH REPLACEMENT CREATING A SURFACE COMPRESSION LAYER THEREIN, THE IMPROVEMENT WHICH COMPRISE POLISHING THE SURFACE OF THE GLASS ARTRICLE, PRIOR TO SAID ION REPLACEMENT, TO SUFFICIENT DEPTH TO SUBSTANTIALLY ELIMINATE MICROCHECKS THAT CAN BE OBSERVED UNDER 100 X MAGNIFICATION AFTER LIGHT ETCHING.
Claim 2
Dependent Claim
85 words
IN THE METHOD FOR STRENGTHENING A POLISHING ALKALI SILICATE GLASS ARTICLE TO INCREASE ITS RESISTANCE TO IMPACT WHEREIN THE ALKALI IONS IN A SURFACE OF THEGLASS ARTICLE ARE REPLACED BY LARGER ALKALI METAL IONS AT AN ELEVATED TEMPERATURE BELOW THE GLASS ANNEALING RANGE, SUCH REPLACEMENT CREATING A SURFACE COMPRESSION LAYER THEREIN, THE IMPROVEMENT WHICH COMPRISE POLISHING THE SURFACE OF THE GLASS ARTRICLE, PRIOR TO SAID ION REPLACEMENT, TO SUFFICIENT DEPTH TO SUBSTANTIALLY ELIMINATE MICROCHECKS THAT CAN BE OBSERVED UNDER 100 X MAGNIFICATION AFTER LIGHT ETCHING.
References Cited (Backward Citations)
US2779136A
Cited
US3218220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |