Patent US4308617A successfully refreshed from Google Patents.
US2686279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor device
Assignee: RCA Corp
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Filing: 1949-09-28
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Granted: 1954-08-10
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Expires: 1969-09-28
Abstract
No abstract record available.
Inventors
- 👤 Loy E Barton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:29
CPC Classifications
H; H10; H10W; H10W76/00; H10W76/40; H10D; H10D99/00; H10P; H10P14/00; H10P14/40; H10P14/46; H10P14/47; H10P95/00; H10W72/00; H10W76/42; H10W76/48; Y; Y10; Y10S; Y10S148/00; Y10S148/118
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
THE PROCESS OF PREPARING A SEMI-CONDUCTOR DEVICE WHICH COMPRISES THE STEPS OF GRINDING A GERMANIUM CRYSTAL UNTIL A SUBSTANTIALLY PLANE SURFACE IS OBTAINED, ELECTROCHEMICALLY STRIPPING A LAYER OF GERMANIUM FROM SAID SURFACE UNTIL SUBSTANTIALLY ALL GRINDING MARKS HAVE DISAPPEARED AND THEREBY OXIDIZING THE THUS PREPARED SURFACE, POSITIONING TWO POINT ELECTRIDES ON THE THUS PREPARED SURFACE, CONNECTING A LARGE-AREA ELECTRODE TO ANOTHER SURFACE OF SAID CRYSTAL, PASSING PULSES OF DIRECT ELECTRIC CURRENT BETWEEN ONE OF SAID POINT ELECTRODES AND SAID LARGE-AREA ELECTRODE, ENCLOSING SAID CRYSTAL AND SAID ELECTRODES IN A SUBSTANTIALLY AIR-TIGHT HOUSING, AND INSERTING A DESICCANT SAID HOUSING.
Claim 2
Dependent Claim
98 words
THE PROCESS OF PREPARING A SEMI-CONDUCTOR DEVICE WHICH COMPRISES THE STEPS OF GRINDING A GERMANIUM CRYSTAL UNTIL A SUBSTANTIALLY PLANE SURFACE IS OBTAINED, ELECTROCHEMICALLY STRIPPING A LAYER OF GERMANIUM FROM SAID SURFACE UNTIL SUBSTANTIALLY ALL GRINDING MARKS HAVE DISAPPEARED AND THEREBY OXIDIZING THE THUS PREPARED SURFACE, POSITIONING TWO POINT ELECTRIDES ON THE THUS PREPARED SURFACE, CONNECTING A LARGE-AREA ELECTRODE TO ANOTHER SURFACE OF SAID CRYSTAL, PASSING PULSES OF DIRECT ELECTRIC CURRENT BETWEEN ONE OF SAID POINT ELECTRODES AND SAID LARGE-AREA ELECTRODE, ENCLOSING SAID CRYSTAL AND SAID ELECTRODES IN A SUBSTANTIALLY AIR-TIGHT HOUSING, AND INSERTING A DESICCANT SAID HOUSING.
Claim 3
Dependent Claim
80 words
A SEMI-CONDUCTOR DEVICE COMPRISING A SEMICONDUCTING BODY OBTAINED BY ELECTROCHEMICALLY REMOVING A LAYER FROM A SURFACE OF SAID BODY AND OXIDIZING SAID SURFACE FROM A SURFACE OF SAID BODY AND IN CONTACT WITH SAID BODY, SAID ELECTRODES INCLUDING AT LEAST ONE POINT ELECTRODE IN CONTACT WITH SAID SURFACE, SAID POINT ELECTRODE BEING FORMED BY PASSING PULSES OF DIRECT CURRENT BETWEEN SAID POINT ELECTRODE AND SAID BODY, A HOUSING ENCLOSING SAID BODY AND SAID ELECTRODES, AND A DESICCANT IN SAID HOUSING.
Claim 4
Dependent Claim
80 words
A SEMI-CONDUCTOR DEVICE COMPRISING A SEMICONDUCTING BODY OBTAINED BY ELECTROCHEMICALLY REMOVING A LAYER FROM A SURFACE OF SAID BODY AND OXIDIZING SAID SURFACE FROM A SURFACE OF SAID BODY AND IN CONTACT WITH SAID BODY, SAID ELECTRODES INCLUDING AT LEAST ONE POINT ELECTRODE IN CONTACT WITH SAID SURFACE, SAID POINT ELECTRODE BEING FORMED BY PASSING PULSES OF DIRECT CURRENT BETWEEN SAID POINT ELECTRODE AND SAID BODY, A HOUSING ENCLOSING SAID BODY AND SAID ELECTRODES, AND A DESICCANT IN SAID HOUSING.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |