US2902419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for the treatment of semi-conductor junction devices
Assignee: Individual
•
Filing: 1957-02-25
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Granted: 1959-09-01
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Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 Carasso John Isaac
- 👤 Speight Eric Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:06
CPC Classifications
H; H10; H10P; H10P50/00; H10P50/60; H10P50/61; H10P50/613; C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/32; C23F1/40; C25; C25F; C25F3/00; C25F3/02; C25F3/12; H10P50/64; H10P50/642
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A METHOD OF ETCHING THE SURFACE OF A BODY OF SEMICNDUCTING MATERIAL AND OF SEMI-CONDUCTOR JUNCTION DEVICES COMPRISING ETCHING THE SURFACE IN A SOLUTION CONSISTING ESSENTIALLY OF A COMPLEXONE, 1-4% BY WEIGHT, AN AUXILIARY COMPLEXING AGENT, 1-2% BY WEIGHT, AND AN ALKALINE METAL HYDROXIDE, 5-30% BY WEIGHT.
Claim 2
Independent Claim
47 words
A METHOD OF ETCHING THE SURFACE OF A BODY OF SEMICNDUCTING MATERIAL AND OF SEMI-CONDUCTOR JUNCTION DEVICES COMPRISING ETCHING THE SURFACE IN A SOLUTION CONSISTING ESSENTIALLY OF A COMPLEXONE, 1-4% BY WEIGHT, AN AUXILIARY COMPLEXING AGENT, 1-2% BY WEIGHT, AND AN ALKALINE METAL HYDROXIDE, 5-30% BY WEIGHT.
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) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |