US3099576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective gold plating of semiconductor contacts
Assignee: Clevite Corp
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Filing: 1960-06-24
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Granted: 1963-07-30
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Expires: 1980-06-24
Abstract
No abstract record available.
Inventors
- 👤 Mocanu Timothy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:12
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/42; H; H10; H10P; H10P14/00; H10P14/40; H10P14/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A METHOD OF SELECTIVELY GOLD PLATING THE ALLOY CONTACTS OF A SILICON SEMICONDUTCTOR DEVICE, COMPRISING: SOAKING THE DEVICE IN A HOT SOLUTION OF AN ALKALI METAL HYDROXIDE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE; PROGRESSIVELY DILUTING SAID SOLUTION TO SUBSTANTIALLY CLEAR HOT WATER WHILE SAID DEVICE REMAINS IMMERSED THEREIN; ADMIXING WITH THE RESULTANT RINSE WATER IN WHICH THE DEVICE IS IMMERSED, A CHEMICAL GOLD PLATING AGENT TO PRODUCE A PLATING BATH CONTAINING POTASSIUM GOLD CYANIDE, AMMONIUM CITRATE, AND ETHYLENE DIAMINE TETRA ACETRIC ACID, AND ADJUSTING THE PH OF THE PLATING BATH TO A VALUE IN THE RANGE OF ABOUT 7 TO 8.
Claim 2
Independent Claim
106 words
A METHOD OF SELECTIVELY GOLD PLATING THE ALLOY CONTACTS OF A SILICON SEMICONDUTCTOR DEVICE, COMPRISING: SOAKING THE DEVICE IN A HOT SOLUTION OF AN ALKALI METAL HYDROXIDE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE; PROGRESSIVELY DILUTING SAID SOLUTION TO SUBSTANTIALLY CLEAR HOT WATER WHILE SAID DEVICE REMAINS IMMERSED THEREIN; ADMIXING WITH THE RESULTANT RINSE WATER IN WHICH THE DEVICE IS IMMERSED, A CHEMICAL GOLD PLATING AGENT TO PRODUCE A PLATING BATH CONTAINING POTASSIUM GOLD CYANIDE, AMMONIUM CITRATE, AND ETHYLENE DIAMINE TETRA ACETRIC ACID, AND ADJUSTING THE PH OF THE PLATING BATH TO A VALUE IN THE RANGE OF ABOUT 7 TO 8.
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) | 1966-07-29 | 1967-01-28 | 1967-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-29 | 1971-01-28 | 1971-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-29 | 1975-01-28 | 1975-07-30 | $7700.00 | Window Closed / Lapsed |