Patent US3144366A successfully refreshed from Google Patents.
US3144366A
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Method of fabricating a plurality of pn junctions in a semiconductor body
Assignee: International Business Machines Corp
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Filing: 1961-08-16
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Granted: 1964-08-11
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Expires: 1981-08-16
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Rideout
- 👤 Thomas K Worthington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:23
CPC Classifications
H; H10; H10P; H10P95/00; C; C23; C23C; C23C14/00; C23C14/04; C23C14/042; H10D; H10D99/00; H10P14/00; H10P14/60; H10P14/63; H10P14/6326; H10P14/6328; H10P14/6332; H10P14/69; H10P14/692; H10P14/6921; H10P14/69215; Y; Y10; Y10S; Y10S148/00; Y10S148/106; Y10S148/169
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE METHOD OF FABRICATING A PLURALITY OF PN JUNCTIONS IN A SEMICONDUCTOR BODY COMPRISING: DEPOSITING ON PREDETERMINED PORTIONS OF A SURFACE OF SAID BODY A FIRST FILM OF A MATERIAL WHICH IS SOLUBLE IN A MEDIUM THAT IS NOT DETRIMENTAL TO SAID BODY; ESTABLISHING ON SAID FIRST FILM AND THE EXPOSED PORTIONS OF SURFACE AN IMPERVIOUS FILM OF A MATERIAL WHICH HAS A LOW SOLUBILITY IN SAID MEDIUM AND HAS A THICKNESS SUBSTANTIALLY THAT OF SAID FIRST FILM; SUBJECTING THE ASSEMBLY TO SAID MEDIUM TO DISSOLVE SAID FIRST FILM BY ATTACKING THE EDGE PORTIONS THEREOF AND THEN UNDERMINING THE REMAINDER TO DISLODGE SAID IMPERVIOUS FILM OVER SAID FIRST FILM, THUS EXPOSING SAID PREDETERMINED PORTIONS OF SAID SURFACE OF SAID BODY WITHOUT APPRECIABLY DISTURBING THE REMAINDER OF SAID IM-
Claim 2
Independent Claim
128 words
THE METHOD OF FABRICATING A PLURALITY OF PN JUNCTIONS IN A SEMICONDUCTOR BODY COMPRISING: DEPOSITING ON PREDETERMINED PORTIONS OF A SURFACE OF SAID BODY A FIRST FILM OF A MATERIAL WHICH IS SOLUBLE IN A MEDIUM THAT IS NOT DETRIMENTAL TO SAID BODY; ESTABLISHING ON SAID FIRST FILM AND THE EXPOSED PORTIONS OF SURFACE AN IMPERVIOUS FILM OF A MATERIAL WHICH HAS A LOW SOLUBILITY IN SAID MEDIUM AND HAS A THICKNESS SUBSTANTIALLY THAT OF SAID FIRST FILM; SUBJECTING THE ASSEMBLY TO SAID MEDIUM TO DISSOLVE SAID FIRST FILM BY ATTACKING THE EDGE PORTIONS THEREOF AND THEN UNDERMINING THE REMAINDER TO DISLODGE SAID IMPERVIOUS FILM OVER SAID FIRST FILM, THUS EXPOSING SAID PREDETERMINED PORTIONS OF SAID SURFACE OF SAID BODY WITHOUT APPRECIABLY DISTURBING THE REMAINDER OF SAID IM-
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) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |