US3799803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface passivation
Assignee: Texas Instruments Inc
•
Filing: 1969-11-13
•
Granted: 1974-03-26
•
Expires: 1989-11-13
Abstract
Abstract PASSIVATION OF A SEMICONDUCTOR SURFACE POLISHED WITH A SOLUTION OF A METHYL ALCOHOL:BROMINE IS COMPLETED BY TREATING THE POLISHED SURFACE WITH A HYDROGEN PEROXIDE SOLUTION AFTER RINSING WITH A SOLUTION OF ALCOHOL AND WATER. NEXT, A DEIONIZED WATER RINSE REMOVES CONTAMINANTS FROM THE HYDROGEN PEROXIDE TREATED SURFACE. FINALLY, THE PASSIVATED SURFACE IS DRIED IN AN ATMOSPHERE OF PURE NITROGEN GAS.
Inventors
- 👤 H Kraus
- 👤 B Breazeale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:47
CPC Classifications
H; H10; H10P; H10P50/00; Y; Y10; Y10S; Y10S148/00; Y10S148/064; Y10S148/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |