Patent US3494760A successfully refreshed from Google Patents.
Patent US4395348A successfully refreshed from Google Patents.
US4395348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoresist stripping composition and method
Assignee: EKC Technology Inc
•
Filing: 1981-11-23
•
Granted: 1983-07-26
•
Expires: 2001-11-23
Abstract
Abstract An organic photoresist stripping composition especially for use with silicon wafers having an insulating layer and metallization on the wafers contains an organic sulfonic acid and 1,2 dihydroxybenzene. The composition also preferably includes a polar or nonpolar, organic solvent. This composition will remove both positive and negative photoresist from wafers without attack on either aluminum metallization or silicon dioxide insulation layers when used to contact the photoresist on the wafers.
Inventors
- 👤 Wai M. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:41
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/43; C11D7/00; C11D7/50; C11D7/5004; C11D7/5009; G; G03; G03F; G03F7/00; G03F7/26; G03F7/42; G03F7/422; G03F7/426; C11D7/22; C11D7/24; C11D7/26; C11D7/263; C11D7/264; C11D7/265; C11D7/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
33 words
A composition for the removal of an organic photoresist from a substrate, which consists essentially of: an organic sulfonic acid and 1,2 dihydroxybenzene in sufficient amounts to remove the photoresist from the substrate.
Claim 2
Dependent Claim
33 words
A composition for the removal of an organic photoresist from a substrate, which consists essentially of: an organic sulfonic acid and 1,2 dihydroxybenzene in sufficient amounts to remove the photoresist from the substrate.
Claim 3
Dependent Claim
13 words
The composition of claim 1 additionally comprising a nonpolar, or polar organic solvent.
Claim 4
Dependent Claim
24 words
The composition of claim 2 in which the nonpolar, organic solvent is an aromatic or alkylaromatic solvent containing from 6 to 20 carbon atoms.
Claim 5
Dependent Claim
56 words
The composition of claim 1 in which the organic sulfonic acid is present in an amount of from about 20 to about 90 weight percent, the 1,2 dihydroxybenzene is present in an amount of from about 0.1 to about 20 weight percent and a nonpolar organic solvent is present from 0 to about 60 weight percent.
Claim 6
Dependent Claim
32 words
The composition of claim 4 comprising from about 30 to about 60 weight percent of the organic sulfonic acid and from about 3 to about 15 weight percent of the 1,2 dihydroxybenzene.
Claim 7
Dependent Claim
33 words
The composition of claim 5 comprising about 35 weight percent of the organic sulfonic acid, about 5 weight percent of the 1,2 dihydroxybenzene, and about 60 weight percent of the nonpolar organic solvent.
Claim 8
Dependent Claim
13 words
The composition of claim 6 in which the nonpolar organic solvent is xylene.
Claim 9
Dependent Claim
29 words
A method of stripping photoresist from a substrate, which comprises contacting the photoresist with the composition of claim 1 at a temperature between about 20° and about 150° C.
Claim 10
Dependent Claim
13 words
The method of claim 8 wherein the substrate is a metallized inorganic substrate.
Claim 11
Dependent Claim
21 words
The method of claim 9 wherein the substrate is a silicon wafer having a silicon dioxide insulation layer metallized with aluminum.
References Cited (Backward Citations)
US3530186A
Cited
US3582401A
Cited
US4165294A
Cited
US4242218A
Cited
US4215005A
Cited
US4221674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-25 | 1987-01-24 | 1987-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-25 | 1991-01-24 | 1991-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-25 | 1995-01-24 | 1995-07-26 | $7700.00 | Window Closed / Lapsed |