Method for the surface treatment of glass
Abstract
Abstract METHOD AND APPARATUS FOR IMPROVING THE PROPERTIES OF GLASS BY THE REPLACEMENT OF IONS IN THE SURFACES OF THE GLASS BY LARGER IONS. THE LOWER SURFACE OF A PIECE OF GLASS TO BE TREATED IN PUT IN CONTACT WITH AN ELECTRICALLY CONDUCTING MOLTEN SALT BATH, A LYER OF ELECTRICALLY CONDUCTING LIQUID IS HELD UNDER VACUUM IN CONTACT WITH THE UPPER SURFACE OF THE GLASS, AND A D.C. SOURCE IS CONNECTED BETWEEN THE TWO BATHS. THE ORGINALLY UPPER SURFCE OF THE GLASS IS SIMILARLY TREATED IN A LTER STEP WHEREIN THE GLASS IS INVERTED. ALTERNATIVELY, A CONTINUOUSLY MOVING RIBBON OF GLASS MAY BE TREATED IN SUCESSIVE STAGES, THE FIRST OF WHICH TREATS ONE SURFACE OF THE GLASS RIBBON AND THE SECOND OF WHICH TREATS THE OTHER SURFACE THEREOF.
Inventors
- 👤 Maurice Bourgeaux
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |