Patent US2935453A successfully refreshed from Google Patents.
US2935453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of semiconductive translating devices
Assignee: GTE Sylvania Inc
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Filing: 1957-04-11
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Granted: 1960-05-03
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Expires: 1977-04-11
Abstract
No abstract record available.
Inventors
- 👤 Edward B Saubestre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:51
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/40; H10P14/46; H10P50/00; H10P50/60; H10P50/64; H10P50/642
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IN THE MANUFACTURE OF ZEMICONDUCTIVE TRANSLATING DEVICES AN IMPROVED METHOD FOR THE PREPARATION OF AN OHMIC METALLIC CONTACT ON A SURFACE OF A SEMICONDUCTIVE SILICON BODY INCLUDING THE STEPS OF FORMING A DISTURBED LAYER ON SAID SURFACE OF SAID BODY, TRATING SAID SURFACE WITH A HYDROFLUORIC-NITRIC ACID SOLUTION CONTAINING BETWEEN 92 TO 98 PARTS BY VOLUME OF HYDROFLUORIC ACID AND BETWEEN 2 TO 8 PARTS BY VOLUME OF NITRIC ACID TO FORM AN ADHERENT BLUE-BLACK FILM ON SAID SURFACE, AND THEREAFTER PLATING A METALLIC CONTACT ONTO SAID FILM.
Claim 2
Dependent Claim
88 words
IN THE MANUFACTURE OF ZEMICONDUCTIVE TRANSLATING DEVICES AN IMPROVED METHOD FOR THE PREPARATION OF AN OHMIC METALLIC CONTACT ON A SURFACE OF A SEMICONDUCTIVE SILICON BODY INCLUDING THE STEPS OF FORMING A DISTURBED LAYER ON SAID SURFACE OF SAID BODY, TRATING SAID SURFACE WITH A HYDROFLUORIC-NITRIC ACID SOLUTION CONTAINING BETWEEN 92 TO 98 PARTS BY VOLUME OF HYDROFLUORIC ACID AND BETWEEN 2 TO 8 PARTS BY VOLUME OF NITRIC ACID TO FORM AN ADHERENT BLUE-BLACK FILM ON SAID SURFACE, AND THEREAFTER PLATING A METALLIC CONTACT ONTO SAID FILM.
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) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |