US3597269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surfce stabilization of semiconductor power devices and article
Assignee: Westinghouse Electric Corp
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Filing: 1969-09-30
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Granted: 1971-08-03
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Expires: 1989-09-30
Abstract
Abstract EXPOSED SURFACES OF A BODY OF SEMICONDUCTOR MATERIAL HAVING A PORTION OF A PN JUNCTION EXPOSED THEREIN ARE ETCHED AND THEN CLEANED WITH EITHER A SOLUTION OF IODINE OR A SOLUTION OF IODINE AND IODINE PENTOXIDE. IMMEDIATELY PRIOR TO DEPOSITING A DIELECTRIC FILM OF SILICON DIOXIDE-SILICON NITRIDE TO OVERLIE THE CLEANED EXPOSED PN JUNCTIONS, ADSORBED IODINE IS REMOVED FROM THE BODY BY HYDROGEN GAS. A RESINOUS PROTECTIVE COATING MATERIAL IS APPLIED TO THE DIELECTRIC FILM TO AFFORD MECHANICAL AND ELECTRICAL PROTECTION.
Inventors
- 👤 Hung C Chang
- 👤 John W Ostroski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:01
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/40; H10W74/47; H10P; H10P95/00; H10W74/10; H10W74/131
Claims Analysis
Total Claims: 0
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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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |