US4517026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of backside heating a semiconductor substrate in an evacuated chamber by directed microwaves for vacuum treating and heating a semiconductor substrate
Assignee: Fujitsu Ltd
•
Filing: 1983-04-08
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Granted: 1985-05-14
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Expires: 2003-04-08
Abstract
Abstract A semiconductor substrate arranged in a vacuum treating chamber is heated by using microwaves. The chamber is provided with a window plate pervious to microwaves, and the substrate is mounted on the window plate. A microwave generator is arranged outside of the chamber. The radiated microwaves are guided to the window plate, penetrate it, and are absorbed by the semiconductor substrate, so that the substrate is directly heated to a predetermined temperature in a short time. Since no microwaves leak through the substrate, no parts in the chamber are heated.
Inventors
- 👤 Minoru Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:21
CPC Classifications
H; H10; H10P; H10P95/00; H10P95/90; C; C23; C23C; C23C14/00; C23C14/22; C23C14/54; C23C14/541
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
97 words
A method of heating a semiconductor substrate, having a back and a surface to be treated, under a reduced pressure within a vacuum treating chamber having a window which is pervious to microwaves, comprising the steps of: (a) arranging the semiconductor substrate so as to expose the surface to be treated to the inside space of the vacuum treating chamber and to cover the window pervious to microwaves with the back of the semiconductor substrate; and (b) irradiating the semiconductor substrate with microwaves through the window pervious to microwaves so that the microwaves heat only the substrate.
Claim 2
Independent Claim
97 words
A method of heating a semiconductor substrate, having a back and a surface to be treated, under a reduced pressure within a vacuum treating chamber having a window which is pervious to microwaves, comprising the steps of: (a) arranging the semiconductor substrate so as to expose the surface to be treated to the inside space of the vacuum treating chamber and to cover the window pervious to microwaves with the back of the semiconductor substrate; and (b) irradiating the semiconductor substrate with microwaves through the window pervious to microwaves so that the microwaves heat only the substrate.
Claim 3
Dependent Claim
29 words
A method according to claim 1, wherein the window pervious to microwaves is a plate made of a material selected from the group consisting of quartz, glass and ceramic.
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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) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |