Apparatus for tempering flat sheets or plates of glass
Abstract
Abstract Tempering thin sheets of flat glass, for example 1/8 inch, by conveying heated sheets to be tempered horizontally between a plurality of upper and lower tubular members which direct individual streams of cooling fluid, under relatively high pressure, against opposite surfaces of the sheet to temper the same, the pressure of the cooling fluid directed against the bottom surface of the sheet being relatively greater than that applied to the upper surface, a volume of back-up air being maintained above the sheet to compensate for the higher pressure applied to the bottom of the sheet and the tubular members above and beneath the sheet being separated into a plurality of groups to minimize turbulence of the cooling fluid.
Inventors
- 👤 George F Ritter Jr
- 👤 Frank J Hymore
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |