US4412388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for drying semiconductor substrates
Assignee: Fujitsu Ltd
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Filing: 1980-12-22
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Granted: 1983-11-01
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Expires: 2000-12-22
Abstract
Abstract A method for drying semiconductor substrates wherein a plurality of semiconductor substrates are irradiated with electromagnetic waves emitted from a waveguide in a non-reactive atmosphere of normal atmospheric pressure while the semiconductor substrates are positioned so that the predominant faces thereof substantially form right angles to the face of an opening of the waveguide.
Inventors
- 👤 Mikio Takagi
- 👤 Hajime Kamioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:32
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0402; H10P72/0406; H10P72/0408; F; F26; F26B; F26B21/00; F26B21/40; F26B3/00; F26B3/32; F26B3/34; F26B3/347; G; G03; G03F; G03F7/00; G03F7/26; G03F7/38; G03F7/40; H10P72/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
97 words
A method for drying semiconductor substrates, which comprises irradiating a plurality of semiconductor substrates with electromagnetic waves emitted from a waveguide in a non-reactive atmosphere of normal atmospheric pressure while holding the semiconductor substrates so that the predominant faces thereof substantially form right angles to the face of an opening of the waveguide, wherein the semiconductor substrates are positioned in a row on a substrate holder and a pair of dummy substrates are placed on the ends of said row, and wherein the substrates are placed at intervals of from about 5 mm to about 20 mm.
Claim 2
Independent Claim
97 words
A method for drying semiconductor substrates, which comprises irradiating a plurality of semiconductor substrates with electromagnetic waves emitted from a waveguide in a non-reactive atmosphere of normal atmospheric pressure while holding the semiconductor substrates so that the predominant faces thereof substantially form right angles to the face of an opening of the waveguide, wherein the semiconductor substrates are positioned in a row on a substrate holder and a pair of dummy substrates are placed on the ends of said row, and wherein the substrates are placed at intervals of from about 5 mm to about 20 mm.
Claim 3
Dependent Claim
27 words
A method according to claim 1, wherein the distance between the semiconductor substrates and the opening face of the waveguide is from about 3 to 10 cm.
Claim 4
Dependent Claim
35 words
A method according to claim 1 or 2, wherein electromagnetic waves having a frequency of from about 1 to about 5 GHz are emitted at an output of from 10 W to about 2 KW.
Claim 5
Independent Claim
142 words
A method for drying semiconductor substrates which comprises simultaneously irradiating for a short period of time a plurality of semiconductor substrates with electromagnetic waves emitted from a waveguide in a non-reactive atmosphere of normal atmospheric pressure while holding the semiconductor substrates so that the predominant faces thereof substantially form right angles to the face of an opening of the waveguide, wherein the semiconductor substrates are positioned on a substrate holder in a row at substantially right angles to the face of the waveguide opening and having a substantially uniform distance therebetween of from about 5 mm to about 20 mm, wherein a pair of dummy substrates is placed on the ends of said row for providing more uniform irradiation throughout, and wherein the distance between the semiconductor substrates and the opening face of the waveguide is from about 3 to 10 mm.
Claim 6
Independent Claim
142 words
A method for drying semiconductor substrates which comprises simultaneously irradiating for a short period of time a plurality of semiconductor substrates with electromagnetic waves emitted from a waveguide in a non-reactive atmosphere of normal atmospheric pressure while holding the semiconductor substrates so that the predominant faces thereof substantially form right angles to the face of an opening of the waveguide, wherein the semiconductor substrates are positioned on a substrate holder in a row at substantially right angles to the face of the waveguide opening and having a substantially uniform distance therebetween of from about 5 mm to about 20 mm, wherein a pair of dummy substrates is placed on the ends of said row for providing more uniform irradiation throughout, and wherein the distance between the semiconductor substrates and the opening face of the waveguide is from about 3 to 10 mm.
Claim 7
Dependent Claim
33 words
A method according to claim 4, wherein electromagnetic waves having a frequency of from about 1 to about 5 GHz are emitted at an output of from 10 W to about 2 KW.
Claim 8
Dependent Claim
22 words
A method according to claim 5, wherein the irradiation time period is appropriately varied dependent upon the energy of the electromagnetic waves.
Claim 9
Dependent Claim
18 words
A method according to claim 1 or 4, wherein the substrate holder is made of an insulating material.
Claim 10
Dependent Claim
25 words
A method according to claim 1 or 4, wherein the substrate holder has a film of material having a high induction heating efficiency, formed thereon.
Claim 11
Dependent Claim
23 words
A method according to claim 7, wherein the substrate holder has a film of material having a high induction heating efficiency, formed thereon.
Claim 12
Dependent Claim
13 words
A method according to claim 8, wherein the film is made of silicon.
Claim 13
Dependent Claim
13 words
A method according to claim 9, wherein the film is made of silicon.
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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |