US2897105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation of p-n junctions
Assignee: International Business Machines Corp
•
Filing: 1952-04-19
•
Granted: 1959-07-28
•
Expires: 1972-04-19
Abstract
No abstract record available.
Inventors
- 👤 Lloyd P Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:24
CPC Classifications
H; H10; H10P; H10P50/00; C; C30; C30B; C30B9/00; H10D; H10D62/00; H10D62/01; H10P10/00; H10P10/12; H10P32/00; H10P32/10; H10P32/12; H10P32/17; H10P32/171; H10P95/00; H10P95/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
THE METHOD OF MAKING JUNCTION-TYPE TRANSISTORS BY JOINING FIRST AND SECOND SEMICONDUCTOR SPECIMENS OF ONE CONDUCTIVITY TYPE WITH A THIRD SEMICONDUCTOR SPECIMEN OF THE OTHER CONDUCTIVITY TYPE, SAID METHOD COMPRISING THE STEPS OF STRESSING THE FIRST AND SECOND SEMICONDUCTOR SPECIMENS AGAINST THE THIRD SEMICONDUCTOR SPECIMEN AT OPPOSITE SURFACES OF THE THIRD SEMICONDUCTOR SPECIMEN, AND HEATING THE SPECIMENS TO A VALUE OF TEMPERATURE WHEREAT THE FIRST AND SECOND SPECIMENS COALESCE WITH THE THIRD SPECIMEN ONLY AT THE RESPECTIVE OPPOSITE SURFACES OF THE THIRD SPECIMEN.
Claim 2
Independent Claim
83 words
THE METHOD OF MAKING JUNCTION-TYPE TRANSISTORS BY JOINING FIRST AND SECOND SEMICONDUCTOR SPECIMENS OF ONE CONDUCTIVITY TYPE WITH A THIRD SEMICONDUCTOR SPECIMEN OF THE OTHER CONDUCTIVITY TYPE, SAID METHOD COMPRISING THE STEPS OF STRESSING THE FIRST AND SECOND SEMICONDUCTOR SPECIMENS AGAINST THE THIRD SEMICONDUCTOR SPECIMEN AT OPPOSITE SURFACES OF THE THIRD SEMICONDUCTOR SPECIMEN, AND HEATING THE SPECIMENS TO A VALUE OF TEMPERATURE WHEREAT THE FIRST AND SECOND SPECIMENS COALESCE WITH THE THIRD SPECIMEN ONLY AT THE RESPECTIVE OPPOSITE SURFACES OF THE THIRD SPECIMEN.
References Cited (Backward Citations)
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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) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |