US4580522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary substrate holder of molecular beam epitaxy apparatus
Assignee: Hitachi Ltd
•
Filing: 1985-02-27
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Granted: 1986-04-08
•
Expires: 2005-02-27
Abstract
Abstract A rotary substrate holder of a molecular beam epitaxy apparatus including leads-cum-posts serving both as leads for passing a current to a heater for heating a substrate and as posts for supporting the heater. By this arrangement, heat transferred from the heater to a bearing disposed in the vicinity of the heater is minimized in amount, thereby prolonging the service life of the holder and minimizing a heat loss thereof.
Inventors
- 👤 Kazumasa Fujioka
- 👤 Sumio Okuno
- 👤 Muneo Mizumoto
- 👤 Hideaki Kamohara
- 👤 Shinjiro Ueda
- 👤 Takao Kuroda
- 👤 Sumio Yamaguchi
- 👤 Naoyuki Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:36
CPC Classifications
C; C30; C30B; C30B23/00; C30B23/02; C30B23/06; C30B23/063
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
A rotary substrate holder of a molecular beam epitaxy apparatus for holding in place a substrate for achieving a molecular beam epitaxial growth, comprising: a heater for heating the substrate; a rotary shaft for rotating the substrate; a stationary shaft arranged coaxially with the rotary shaft; and drive means for driving said rotary shaft for rotation; wherein the improvement comprises: leads-cum-posts extending through an interior of said stationary shaft which is located inside said rotary shaft and serving both as leads for passing a current to the heater and as posts for supporting the heater; and means for holding said leads-cum-posts in position.
Claim 2
Dependent Claim
103 words
A rotary substrate holder of a molecular beam epitaxy apparatus for holding in place a substrate for achieving a molecular beam epitaxial growth, comprising: a heater for heating the substrate; a rotary shaft for rotating the substrate; a stationary shaft arranged coaxially with the rotary shaft; and drive means for driving said rotary shaft for rotation; wherein the improvement comprises: leads-cum-posts extending through an interior of said stationary shaft which is located inside said rotary shaft and serving both as leads for passing a current to the heater and as posts for supporting the heater; and means for holding said leads-cum-posts in position.
Claim 3
Dependent Claim
46 words
A rotary substrate holder of a molecular beam epitaxy apparatus as claimed in claim 1, wherein said leads-cum-posts extending through said stationary shaft are supported by a terminal plate secured to an end portion of said stationary shaft which end portion is remote from the heater.
Claim 4
Dependent Claim
43 words
A rotary substrate holder of a molecular beam epitaxy apparatus as claimed in claim 2, further comprising an auxiliary post merely serving to support said heater, said auxiliary post extending through the interior of said stationary shaft and supported by said terminal plate.
Claim 5
Dependent Claim
31 words
A rotary substrate holder of a molecular beam epitaxy apparatus as claimed in claim 1, further comprising radiation shield plates mounted between said leads-cum-posts and a wall of the stationary shaft.
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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) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |