US3042593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical method for cleansing semiconductive devices
Assignee: Lanteris Space LLC
•
Filing: 1957-09-23
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Granted: 1962-07-03
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Expires: 1977-09-23
Abstract
No abstract record available.
Inventors
- 👤 Michlin William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:20
CPC Classifications
C; C25; C25F; C25F1/00; H; H10; H10P; H10P50/00; H10P50/60; H10P50/61; H10P50/613
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
A METHOD FOR CLEANSING A SEMICAONDUCTOR DEVICE WHICH COMPRISES A BODY OF SEMICONDUCIVE MATERIAL AND A RECTIFIER ELECTRODE POSITIONED THEREON CONTAINING AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, GALLIUM AND INDIUM, SAID METHOD COMPRISING THE STEPS OF: APPLYING AN ELECTROLYTE TO SAID ELECTRODE AND TO THE SURFACE PORTION OF SAID BODY SURROUNDING SAID ELECTRODE WHILE MAINTAINING SAID ELECTRODE AT A POTENTIAL POSITIVE WITH RESPECT TO SAID ELECTROLYTE; SAID ELECTROLYTE CONSISTING ESSENTIALLY OF WATER, A FIRST SUBSTANCE COMPOSED OF AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE, FOR SUPPLYING SAID ELECTROLYTE WITHHYDROXYL IONS, AND A SECOND SUBSTANCE COMPOSED OF AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM CYANIDE AND POTASSIUM CYANIDE, FOR SUPPLY ING SAID ELECTROLYTE WITH CYANIDE IONS, SAID FIRST AND SECOND SUBSTANCES HAVING RESPECTIVE CONCENTRATIONS IN SAID WATER SUCH THAT THE HYDROXYL ION CONCENTRATION THEREIN IS BETWEEN ABOUT 0.025 MOLAL AND ABOUT 1.5 MOLAL, THE CYANIDE ION CONCENTRATION THEREIN IS BETWEEN ABOUT 0.1 MOLAL AND ABOUT SIX MOLAL, AND THE QUOTIENT OF SAID HYDROXYL ION CONCENTRATION DIVIDED BY SAID CYANIDE ION CONCENTRATION HAS A MAXIMUM VALUE OF ABOUT 0.25.
Claim 2
Independent Claim
194 words
A METHOD FOR CLEANSING A SEMICAONDUCTOR DEVICE WHICH COMPRISES A BODY OF SEMICONDUCIVE MATERIAL AND A RECTIFIER ELECTRODE POSITIONED THEREON CONTAINING AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, GALLIUM AND INDIUM, SAID METHOD COMPRISING THE STEPS OF: APPLYING AN ELECTROLYTE TO SAID ELECTRODE AND TO THE SURFACE PORTION OF SAID BODY SURROUNDING SAID ELECTRODE WHILE MAINTAINING SAID ELECTRODE AT A POTENTIAL POSITIVE WITH RESPECT TO SAID ELECTROLYTE; SAID ELECTROLYTE CONSISTING ESSENTIALLY OF WATER, A FIRST SUBSTANCE COMPOSED OF AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE, FOR SUPPLYING SAID ELECTROLYTE WITHHYDROXYL IONS, AND A SECOND SUBSTANCE COMPOSED OF AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM CYANIDE AND POTASSIUM CYANIDE, FOR SUPPLY ING SAID ELECTROLYTE WITH CYANIDE IONS, SAID FIRST AND SECOND SUBSTANCES HAVING RESPECTIVE CONCENTRATIONS IN SAID WATER SUCH THAT THE HYDROXYL ION CONCENTRATION THEREIN IS BETWEEN ABOUT 0.025 MOLAL AND ABOUT 1.5 MOLAL, THE CYANIDE ION CONCENTRATION THEREIN IS BETWEEN ABOUT 0.1 MOLAL AND ABOUT SIX MOLAL, AND THE QUOTIENT OF SAID HYDROXYL ION CONCENTRATION DIVIDED BY SAID CYANIDE ION CONCENTRATION HAS A MAXIMUM VALUE OF ABOUT 0.25.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |