Patent US5071485A successfully refreshed from Google Patents.
US5071485A
Expired / Lapsed
US
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Method for photoresist stripping using reverse flow
Assignee: LG Electronics Inc
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Filing: 1990-09-11
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Granted: 1991-12-10
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Expires: 2010-09-11
Abstract
Abstract A method and apparatus for stripping a photoresist layer from a semiconductor wafer, wherein oxidizing gas is fed from the edge of the wafer to the center. The oxidizing gas may be directed so that it is incident on the heated wafer support platform before it is incident on the wafer.
Inventors
- 👤 John C. Matthews
- 👤 Robert D. Wooten
- 👤 David S. Ferris
- 👤 Stuart N. Rounds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:47
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0402; H10P72/0406
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A method of stripping a layer of photoresist from a substrate, wherein the substrate is placed on a heated surface and oxidizing fluid is passed through a space over the photoresist layer, comprising the steps of, providing a heated surface on which said substrate is placed, providing a second surface which is separated from said heated surface so as to form a space therebetween, said space having a peripheral area which encompasses the periphery of the space, and a central area, feeding said oxidizing fluid to the peripheral area of said space, and removing said oxidizing fluid at said central area of said space, whereby a flow of said oxidizing fluid through said space and over said photoresist layer from the peripheral area of the space to the central area is established,
Claim 2
Independent Claim
132 words
A method of stripping a layer of photoresist from a substrate, wherein the substrate is placed on a heated surface and oxidizing fluid is passed through a space over the photoresist layer, comprising the steps of, providing a heated surface on which said substrate is placed, providing a second surface which is separated from said heated surface so as to form a space therebetween, said space having a peripheral area which encompasses the periphery of the space, and a central area, feeding said oxidizing fluid to the peripheral area of said space, and removing said oxidizing fluid at said central area of said space, whereby a flow of said oxidizing fluid through said space and over said photoresist layer from the peripheral area of the space to the central area is established,
Claim 3
Dependent Claim
37 words
The method of claim 1 wherein when said oxidizing fluid is fed to the peripheral area of said space, it is directed so as to come in contact with said heated surface before contacting said photoresist layer.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein said space comprises a narrow gap.
Claim 5
Dependent Claim
12 words
The method of claim 2 wherein said space comprises a narrow gap.
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) | 1994-12-09 | 1995-06-10 | 1995-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-09 | 1999-06-10 | 1999-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-09 | 2003-06-10 | 2003-12-10 | $7700.00 | Window Closed / Lapsed |