US3806331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass heating and tempering apparatus
Assignee: Saint Gobain Industries SA
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Filing: 1971-12-15
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Granted: 1974-04-23
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Expires: 1991-12-15
Abstract
Abstract A tunnel system is provided which heats glass plates horizontally for tempering, delivers them to tempering apparatus with more even temperature, in a shorter time, controls temperature between the heating and blowing sections, controls air turbulence at the discharge port of the heating unit, and applies the blowing air on novel principles, producing a more perfectly tempered plate.
Inventors
- 👤 A Bezombes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:25
CPC Classifications
C; C03; C03B; C03B27/00; C03B27/04; C03B27/0417; C03B27/044; C03B29/00; C03B29/04; C03B29/06; C03B29/08
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) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |