Patent US3422857A successfully refreshed from Google Patents.
Patent US3954498A successfully refreshed from Google Patents.
US3954498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum foil cleaning process
Assignee: Motorola Solutions Inc
•
Filing: 1974-10-03
•
Granted: 1976-05-04
•
Expires: 1994-10-03
Abstract
Abstract A process for preparing an aluminum foil for coating with photoresist for the purpose of preparing an etched strip for semiconductor assembly utilizing the step of cleaning said aluminum surface with a water solution comprising one to five percent ammonium persulfate, one to five percent sodium chlorate and one to three percent of a surfactant selected from the group consisting of dioctyl sodium sulfo succinate and dodecyl benzene sulfonate.
Inventors
- 👤 Dervin L. Flowers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:09
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/24; H; H10; H10W; H10W70/00; H10W70/01; H10W70/04; H10W70/045
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A process for preparing an aluminum foil for coating with photoresist for the purpose of preparing an etched strip for semiconductor assembly comprising the step of cleaning said aluminum foil with a water solution comprising one to five percent ammonium persulfate, one to five percent sodium chlorate and one to three percent of a surfactant selected from the group consisting of dioctyl sodium sulfo succinate and dodecyl benzene sulfonate.
Claim 2
Dependent Claim
69 words
A process for preparing an aluminum foil for coating with photoresist for the purpose of preparing an etched strip for semiconductor assembly comprising the step of cleaning said aluminum foil with a water solution comprising one to five percent ammonium persulfate, one to five percent sodium chlorate and one to three percent of a surfactant selected from the group consisting of dioctyl sodium sulfo succinate and dodecyl benzene sulfonate.
Claim 3
Dependent Claim
15 words
A process as recited in claim 1 wherein said solution is heated to about 50°C.
Claim 4
Dependent Claim
54 words
A process of cleaning an aluminum surface comprising the step of cleaning said aluminum surface with a water solution comprising one to 5 percent ammonium persulfate, one to five percent sodium chlorate and one to three percent of a surfactant selected from the group consisting of dioctyl sodium sulfo succinate and dodecyl benzene sulfonate.
Claim 5
Dependent Claim
54 words
A process of cleaning an aluminum surface comprising the step of cleaning said aluminum surface with a water solution comprising one to 5 percent ammonium persulfate, one to five percent sodium chlorate and one to three percent of a surfactant selected from the group consisting of dioctyl sodium sulfo succinate and dodecyl benzene sulfonate.
Claim 6
Dependent Claim
15 words
A process as recited in claim 3 wherein said solution is heated to about 50°C.
Claim 7
Dependent Claim
32 words
A process as recited in claim 3 wherein said solution comprises three percent ammonium persulfate and three percent sodium chlorate and said solution is heated to a temperature between 30° - 100°C.
References Cited (Backward Citations)
US2567835A
Cited
US2678876A
Cited
US2795490A
Cited
US3048547A
Cited
US3051603A
Cited
US3140203A
Cited
US3345217A
Cited
US3634262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |