US3231422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for surface treatment of semiconductor devices of the junction type
Assignee: Siemens Schuckertwerke AG
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Filing: 1962-01-23
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Granted: 1966-01-25
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Expires: 1982-01-23
Abstract
No abstract record available.
Inventors
- 👤 Emeis Reimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:08
CPC Classifications
H; H10; H10P; H10P50/00; H10P50/60; H10P50/64; H10P50/642; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE METHOD OF TREATING THE SURFACE OF ESSENTIALLY MONOCRYSTALLINE P-N JUNCTION SEMICONDUCTOR BODIE OF SILICON HAVING A P-N JUNCTION EMERGIN AT THE SURFACE TO STABILIZE THE BLOCKING VOLTAGE OF THE P-N JUNCTION, WHICH COMPRISES THE STEPS OF REMOVING A DISTURBED CRYSTAL LAYER AT THE SEMICONDUCTOR SURFACE BY SUBJECTING THE BODY TO AN ETCHING LIQUID CONTAINING A MIXTURE OF NITRIC ACID AND HYDROFLUORIC ACID, AND THEN ADDITIONALLY EXPOSING THE ETCHED SURFACE TO THE VAPORS EVOLVING FROM SAID ETCHING LIQUID FOR A PERIOD OF TIME SUFFICIENT TO PRODUCE A CHANGE IN COLOR OF THE SURFACE.
Claim 2
Independent Claim
93 words
THE METHOD OF TREATING THE SURFACE OF ESSENTIALLY MONOCRYSTALLINE P-N JUNCTION SEMICONDUCTOR BODIE OF SILICON HAVING A P-N JUNCTION EMERGIN AT THE SURFACE TO STABILIZE THE BLOCKING VOLTAGE OF THE P-N JUNCTION, WHICH COMPRISES THE STEPS OF REMOVING A DISTURBED CRYSTAL LAYER AT THE SEMICONDUCTOR SURFACE BY SUBJECTING THE BODY TO AN ETCHING LIQUID CONTAINING A MIXTURE OF NITRIC ACID AND HYDROFLUORIC ACID, AND THEN ADDITIONALLY EXPOSING THE ETCHED SURFACE TO THE VAPORS EVOLVING FROM SAID ETCHING LIQUID FOR A PERIOD OF TIME SUFFICIENT TO PRODUCE A CHANGE IN COLOR OF THE SURFACE.
References Cited (Backward Citations)
US2740700A
Cited
US2930722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |