Patent US2878147A successfully refreshed from Google Patents.
US2878147A
Expired / Lapsed
US
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Method of making semi-conductive device
Assignee: Individual
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Filing: 1957-04-02
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Granted: 1959-03-17
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Expires: 1977-04-02
Abstract
No abstract record available.
Inventors
- 👤 Beale Julian Robert Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:42
CPC Classifications
H; H10; H10P; H10P95/00; H10D; H10D99/00; H10P50/00; H10P50/69; H10P50/691
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A METHOD OF MANUFACTURING A SEMI-CONDUCTIVE DEVICE, COMPRISING DIFFUSING A CONDUCTIVITY-DETERMINING IMPURITY FROM THE SURFACE OF AND INTO A SEMI-CONDUCTIVE BODY OF ONE CONDUCTIVITY TYPE TO PRODUCE THEREIN A DIF-FUSED REGION OF THE OPPOSITE CONDUCTIVITY TYPE AND A DIFFUSED P-N JUNCTION, APPLYING AN OHMIC CONTACT TO A DESIRED SURFACE PORTION OF THE DIFFUSED REGION OF OPPOSITE CONDUCTIVITY, WHICH CONTACTED SURFACE PORTION HAS AN AREA SMALLER THAN THE AREA OF THE TOTAL SURFACE OF SAID DIFFUSED REGION, AND SUBJECTING THE THUS-FORMED BODY TO AN ETCHING TREATMENT WITH AN ETCHING SOLUTION WHICH DISSOLVES ONLY THE SEMI-CONDUCTIVE BODY BUT NOT THE OHMIC CONTACT UNTIL ALL OF THE SAID DIFFUSED REGION EXCEPT THAT PORTION DIRECTLY UNDERLYING AND PROTECTED BY THE OHMIC CONTACT HAS BEEN REMOVED.
Claim 2
Independent Claim
121 words
A METHOD OF MANUFACTURING A SEMI-CONDUCTIVE DEVICE, COMPRISING DIFFUSING A CONDUCTIVITY-DETERMINING IMPURITY FROM THE SURFACE OF AND INTO A SEMI-CONDUCTIVE BODY OF ONE CONDUCTIVITY TYPE TO PRODUCE THEREIN A DIF-FUSED REGION OF THE OPPOSITE CONDUCTIVITY TYPE AND A DIFFUSED P-N JUNCTION, APPLYING AN OHMIC CONTACT TO A DESIRED SURFACE PORTION OF THE DIFFUSED REGION OF OPPOSITE CONDUCTIVITY, WHICH CONTACTED SURFACE PORTION HAS AN AREA SMALLER THAN THE AREA OF THE TOTAL SURFACE OF SAID DIFFUSED REGION, AND SUBJECTING THE THUS-FORMED BODY TO AN ETCHING TREATMENT WITH AN ETCHING SOLUTION WHICH DISSOLVES ONLY THE SEMI-CONDUCTIVE BODY BUT NOT THE OHMIC CONTACT UNTIL ALL OF THE SAID DIFFUSED REGION EXCEPT THAT PORTION DIRECTLY UNDERLYING AND PROTECTED BY THE OHMIC CONTACT HAS BEEN REMOVED.
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) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |