US2989426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of transistor manufacture
Assignee: International Business Machines Corp
•
Filing: 1957-06-06
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Granted: 1961-06-20
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Expires: 1977-06-06
Abstract
No abstract record available.
Inventors
- 👤 Richard F Rutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:12
CPC Classifications
H; H10; H10P; H10P95/00; H10D; H10D88/00; H10D99/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
THE METHOD OF MAKING A SEMICONDUCTOR DEVICE COMPRISING THE STEPS OF DIFFUSING SUFFICIENT OPPOSITE CONDUCTIVITY TYPE DIRECTING IMPURITIES INTO AT LEAST ONE SURFACE OF A SEMICONDUCTOR CRYSTAL OF AN ORIGINAL CONDUCTIVITY TYPE TO CONVERT THE CONDUCTIVITY TYPE OF A PORTION OF SAID CRYSTAL TO A PREDETERMINED DEPTH, REMOVING THE ENDS OF SAID CRYSTAL TO THEREBY FORM A SANDWICH OF ALTERNATE CONDUCTIVITY TYPE ZONES, THE MIDDLE ZONE COMPRISING THE ORIGINAL CONDUCTIVITY TYPE PORTION, ALLOYING AT LEAST ONE RECTIFYING CONNECTION INTO SAID CONVERTED PORTION OF SAID CRYSTAL IN A RESTRICTED AREA TO A DEPTH CORRESPONDING TO A SPECIFIC RESISTIVITY VALUE, SELECTED IN ACCORDANCE WITH THE PERFORMANCE CHARACTERISTICS DESIRED FROM THE SEMICON-
Claim 2
Independent Claim
109 words
THE METHOD OF MAKING A SEMICONDUCTOR DEVICE COMPRISING THE STEPS OF DIFFUSING SUFFICIENT OPPOSITE CONDUCTIVITY TYPE DIRECTING IMPURITIES INTO AT LEAST ONE SURFACE OF A SEMICONDUCTOR CRYSTAL OF AN ORIGINAL CONDUCTIVITY TYPE TO CONVERT THE CONDUCTIVITY TYPE OF A PORTION OF SAID CRYSTAL TO A PREDETERMINED DEPTH, REMOVING THE ENDS OF SAID CRYSTAL TO THEREBY FORM A SANDWICH OF ALTERNATE CONDUCTIVITY TYPE ZONES, THE MIDDLE ZONE COMPRISING THE ORIGINAL CONDUCTIVITY TYPE PORTION, ALLOYING AT LEAST ONE RECTIFYING CONNECTION INTO SAID CONVERTED PORTION OF SAID CRYSTAL IN A RESTRICTED AREA TO A DEPTH CORRESPONDING TO A SPECIFIC RESISTIVITY VALUE, SELECTED IN ACCORDANCE WITH THE PERFORMANCE CHARACTERISTICS DESIRED FROM THE SEMICON-
References Cited (Backward Citations)
US2654059A
Cited
US2821493A
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US2813233A
Cited
US2861018A
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US2817609A
Cited
US2879190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |