US3287200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of strengthening glass by ion exchange and articles therefrom
Assignee: PPG Industries Inc
•
Filing: 1962-10-04
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Granted: 1966-11-22
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Expires: 1982-10-04
Abstract
No abstract record available.
Inventors
- 👤 Albert R Hess
- 👤 George E Sleighter
- 👤 Fred M Ernsberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:53
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/002; C03B; C03B27/00; C03B27/02; C03B27/03; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
103 words
A METHOD OF STRENGTHENING A GLASS ARTICLE CONTAIN: ING AN ALKALI-METAL WHICH COMPRISES TEMPERING THE GLASS TO PLACE A COMPRESSION ZONE IN THE SURFACE OF THE ARTICLE AND THERAFTER PLACING A HIGHER COMPRESSION IN THE SURFACE OF THE ARTICLE TO A LESSER DEPTH THAN THE DEPTH OF SAID COMPRESSION ZONE BY REPLACING THE ALKALI-METAL IONS IN SAID LESSER DEPTH OF THE COMPRESSION ZONE BY LARGER ALKALIMETA IONS BY CONTACTING THE GLASS WITH A SOURCE OF LARGER ALKALI-META IONS WHILE RETAINING THE GLASS AT TEMPERATURE BELOW THE STRAIN POINT OF THE GLASS UNTIL THE HIGHER DEGREE OF COMPRESSION IS IMPARTED TO SUCH LESSER DEPTH
Claim 2
Independent Claim
103 words
A METHOD OF STRENGTHENING A GLASS ARTICLE CONTAIN: ING AN ALKALI-METAL WHICH COMPRISES TEMPERING THE GLASS TO PLACE A COMPRESSION ZONE IN THE SURFACE OF THE ARTICLE AND THERAFTER PLACING A HIGHER COMPRESSION IN THE SURFACE OF THE ARTICLE TO A LESSER DEPTH THAN THE DEPTH OF SAID COMPRESSION ZONE BY REPLACING THE ALKALI-METAL IONS IN SAID LESSER DEPTH OF THE COMPRESSION ZONE BY LARGER ALKALIMETA IONS BY CONTACTING THE GLASS WITH A SOURCE OF LARGER ALKALI-META IONS WHILE RETAINING THE GLASS AT TEMPERATURE BELOW THE STRAIN POINT OF THE GLASS UNTIL THE HIGHER DEGREE OF COMPRESSION IS IMPARTED TO SUCH LESSER DEPTH
Claim 3
Dependent Claim
10 words
A GLASS ARTICLE PRODUCED BY THE METHOD OF CLAIM 1.
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 |