US3650701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for growing crystalline bodies
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1970-07-22
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Granted: 1972-03-21
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Expires: 1990-07-22
Abstract
Abstract The apparatus comprises a gastight furnace locating a crucible which may be rotated by a motor located under the furnace. A rod vertically movable in a tubular extension of the furnace cover is adapted to pull a crystal from a melt in the crucible. The cover has a side arm which is pivotally connected to a lateral extension of a vertical shaft adapted to swing about its axis into a position where the crystal clears the furnace only after the shaft has been raised to a predetermined position. Additional pivotal movement of the side arm then provides access to the furnace body if necessary.
Inventors
- 👤 Francis Forrat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:44
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/30; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032; Y10T117/1064; Y10T117/1072
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
An apparatus according to claim 1, including means for limiting the extent of pivotal movement of said shaft when in said predetermined position.
Claim 2
Dependent Claim
28 words
An apparatus according to claim 2, wherein the extent of angular movement of said shaft is just sufficient for the crystal pulling mechanism to clear the body laterally.
Claim 3
Dependent Claim
22 words
An apparatus according to claim 2, having manually releasable locking means for retaining said lateral extension and side arm in aligned condition.
Claim 4
Dependent Claim
38 words
An apparatus according to claim 4, having means for restraining pivotal movement of said side arm to an extent just sufficient for the cover to clear said body upon combined pivotal movement of said sode arm and shaft.
Claim 5
Dependent Claim
29 words
An apparatus according to claim 1, including a splined connection between said shaft and a stationary frame, said connection being inoperative when said shaft is at said predetermined level.
Claim 6
Dependent Claim
14 words
An apparatus according to claim 1, wherein said shaft carries said crystal pulling means.
Claim 7
Dependent Claim
48 words
An apparatus according to claim 1, having a crucible in said furnace, a vertical rod slidably sealingly projecting through a bottom assembly of said furnace, motor means for rotating said rod and crucible, and motor means for moving said rotating means, rod and crucible vertically as a whole.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
US3275417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |