US3860736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal furnace
Assignee: HP Inc
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Filing: 1973-10-29
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Granted: 1975-01-14
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Expires: 1993-10-29
Abstract
Abstract A chamber is provided which includes baffles, plates, and support members situated around a centrally located heater and crucible to define a hot zone in the lower half of the chamber where gas currents are quickly heated and thence sent to the upper half of the chamber. As a result, the motion of these currents around the hot zone is reduced, which reduction permits thermal gradients to be maintained around the crucible for controlling crystal growth therein. A resistance heater provides heat for a crystal melt contained inside the crucible.
Inventors
- 👤 William M Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:26
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/06; F27B14/061; C; C30; C30B; C30B15/00; C30B15/14; F27B14/08; F27B14/14; F27B14/143; F27D; F27D99/00; F27D99/0001; F27D99/0006; F27D2099/0008
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
104 words
A crystal growing furnace, comprising: a chamber having internal walls and external walls; a crucible disposed inside the chamber for containing a crystal melt; means supporting said crucible for selectively moving said crucible inside said chamber; a resistance heater surrounding the crucible; baffle means surrounding the heater and crucible for conserving heat; an internal plate within the chamber in cooperating disposition with the baffle means for defining a Heat-conserving zone around the heater and below said plate and for establishing an upper region above said plate, said internal plate having an opening through which the crucible may pass into and above the heat-conserving zone.
Claim 2
Dependent Claim
104 words
A crystal growing furnace, comprising: a chamber having internal walls and external walls; a crucible disposed inside the chamber for containing a crystal melt; means supporting said crucible for selectively moving said crucible inside said chamber; a resistance heater surrounding the crucible; baffle means surrounding the heater and crucible for conserving heat; an internal plate within the chamber in cooperating disposition with the baffle means for defining a Heat-conserving zone around the heater and below said plate and for establishing an upper region above said plate, said internal plate having an opening through which the crucible may pass into and above the heat-conserving zone.
Claim 3
Dependent Claim
36 words
A crystal growing furnace as in claim 1 wherein the chamber includes an upper plate having an opening therein, and a rod entering the chamber through said opening for placing a crystal seed in the crucible.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |