US3650719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical and thermal tempering of vitreous materials
Assignee: AGC Glass Europe SA
•
Filing: 1968-04-26
•
Granted: 1972-03-21
•
Expires: 1988-04-26
Abstract
Abstract A process for treating vitreous materials to temper them which includes first chemically and then thermally tempering such materials.
Inventors
- 👤 Robert Van Laethem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:34
CPC Classifications
C; C03; C03C; C03C21/00; C03B; C03B27/00; C03B27/02; C03B27/03; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
16 words
A process as defined in claim 1 wherein said medium forms a coating on said body.
Claim 2
Dependent Claim
14 words
A process as defined in claim 1 wherein the larger ions are potassium ions.
Claim 3
Dependent Claim
59 words
A process as defined in claim 1 wherein said body has substantial transparency to infrared radiation, and wherein said heating step is performed by heating the interior layers of the body with infrared radiation which is absorbed by the body and maintaining the exterior layers of the body below the annealing point by using a gaseous medium during irradiation.
Claim 4
Dependent Claim
27 words
A process as defined in claim 4 wherein said body is soda-lime glass, and a substantial proportion of the radiation has a wavelength below about 2.8 microns.
Claim 5
Dependent Claim
24 words
A process as defined in claim 5 wherein during the heating step the interior layers of the glass are heated above the annealing point.
Claim 6
Dependent Claim
24 words
A process as defined in claim 5 wherein during the heating step the interior layers of the glass are heated above the softening point.
Claim 7
Dependent Claim
13 words
A process as defined in claim 1 wherein said body is soda-lime glass.
Claim 8
Dependent Claim
13 words
A process according to claim 2 wherein the coating is in film form.
Claim 9
Dependent Claim
59 words
In a process for tempering a body of vitreous or vitrocrystalline material containing exchangeable ions, the improvement wherein the process is a process according to claim 1 wherein the tempering comprises thermal tempering subsequent to chemical tempering and said heating is such as to maintain external layers of said body at a temperature below that of the internal layers.
Claim 10
Dependent Claim
26 words
A process according to claim 10 wherein said heating is such as to heat internal layers of said body at a temperature above the annealing point.
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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |