Patent US3563717A successfully refreshed from Google Patents.
US3563717A
Expired / Lapsed
US
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Method of producing hollow glass bricks
Assignee: Compagnie de Saint Gobain SA
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Filing: 1968-01-08
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Granted: 1971-02-16
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Expires: 1988-01-08
Abstract
Abstract A METHOD FOR PRODUCING HOLLOW GLASS BRICKS WITH AT ENAMAL COATING. THE METHOD COMPRISES THE APPLICATIOR OF THE ENAMEL TO THE INNER SURFACE OF HALF BRICKS WHILE THEY ARE MAINTAINED AT ROOM TEMPERATURE, HEATING OF THE HALF BRICKS TO ABOVE THEIR UPPER GLASS TRANSFORMATION TEMPERATURE BUT BELOW THEIR LIQUIFYING TEMPERATURE WHILE THE HALF BRICKS ARE RESTING ON ONE OF THEIR NARROW SIDES, AND THEN WELDING THE TWO HALF BRICKS TOGETHER ALONG EDGES TO FORM A COLORED TRANSPARENT WHOLE GLASS BRICK.
Inventors
- 👤 Heinz Bertram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:06
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/20; C03B23/24
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |