Patent US3212871A successfully refreshed from Google Patents.
US3212871A
Expired / Lapsed
US
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Electrically heated tank furnace for melting quartz
Assignee: Osram GmbH
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Filing: 1961-12-06
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Granted: 1965-10-19
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Expires: 1981-12-06
Abstract
No abstract record available.
Inventors
- 👤 Vatterodt Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:11
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/02; C03B5/033; C03B5/0336; C03B17/00; C03B17/04; C03B3/00; C03B5/16; C03B5/225; Y; Y10; Y10S; Y10S65/00; Y10S65/04; Y10S65/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
AN ELECTRICALLY HEATED TANK FURNACE FOR MELTING QUARTZ, SAID FURNACE HAVING A TUBULAR MELTING CRUCIBLE SURROUNDED BY HEATING WIRES, A DRAWING NOZZLE IN THE LOWER END OF THE CURCIBLE FOR CONTINUOUSLY DRAWING QUARTZ GLASS TUBING FROM THE MELT IN SAID CRUCIBLE, MEANS INTODUCING PROTECTIVE GAS TO THE INTERIOR OF SAID CRUCIBLE ABOVE THE MELT THEREIN, CHARACTERIZED IN THAT THE CRUCIBLE WALL ABOVE THE PROXIMATE TO THE MELT TIP SURFACE IS PROVIDED WITH A PLURALITY OF HOLES THERETHROUGH TO THE EXTERIOR OF THE CRUCIBLE FOR OUTWARD PASSAGE OF SAID GAS WHEREBY VAPORS GETTING FREE FROM THE MELT SURFACE ARE PREVENTED FROM RISING IN THE CRUCIBLE BUT ARE CARRIED ALONG BY THE FLOW OF THE PROTECTIVE GAS ESCAPING THROUGH SAID HOLES TO THE OUTSIDE OF THE CRUCIBLE.
Claim 2
Dependent Claim
125 words
AN ELECTRICALLY HEATED TANK FURNACE FOR MELTING QUARTZ, SAID FURNACE HAVING A TUBULAR MELTING CRUCIBLE SURROUNDED BY HEATING WIRES, A DRAWING NOZZLE IN THE LOWER END OF THE CURCIBLE FOR CONTINUOUSLY DRAWING QUARTZ GLASS TUBING FROM THE MELT IN SAID CRUCIBLE, MEANS INTODUCING PROTECTIVE GAS TO THE INTERIOR OF SAID CRUCIBLE ABOVE THE MELT THEREIN, CHARACTERIZED IN THAT THE CRUCIBLE WALL ABOVE THE PROXIMATE TO THE MELT TIP SURFACE IS PROVIDED WITH A PLURALITY OF HOLES THERETHROUGH TO THE EXTERIOR OF THE CRUCIBLE FOR OUTWARD PASSAGE OF SAID GAS WHEREBY VAPORS GETTING FREE FROM THE MELT SURFACE ARE PREVENTED FROM RISING IN THE CRUCIBLE BUT ARE CARRIED ALONG BY THE FLOW OF THE PROTECTIVE GAS ESCAPING THROUGH SAID HOLES TO THE OUTSIDE OF THE CRUCIBLE.
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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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |