US2843809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistors
Assignee: Corvey Engineering Co
•
Filing: 1954-05-11
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Granted: 1958-07-15
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Expires: 1974-05-11
Abstract
No abstract record available.
Inventors
- 👤 Arthur A Varela
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:14
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/40; H10P14/46; H10D; H10D99/00; Y; Y10; Y10S; Y10S438/00; Y10S438/977
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
27 words
A TRANSITOR COMPRISING A SEMICONDUCTOR BODY HAVING SURFACE BARRIERS EXTENDING FROM A COMMON ETCHED EDGE, AND EMITTER AND COLLECTOR ELECTRODES IN INTIMATE CONTACT WITH SAILD SURFACE BARRIERS.
Claim 2
Dependent Claim
27 words
A TRANSITOR COMPRISING A SEMICONDUCTOR BODY HAVING SURFACE BARRIERS EXTENDING FROM A COMMON ETCHED EDGE, AND EMITTER AND COLLECTOR ELECTRODES IN INTIMATE CONTACT WITH SAILD SURFACE BARRIERS.
Claim 3
Dependent Claim
87 words
IN THE MANUFACTURE OF A SURFACE-BARRIER TRANSISTOR, THE STEPS INCLUDING CUTTING A SUBSTANTIALLY RECTANGULAR GERMANIUM BASE HAVING A STRAIGHT EDGE FROM A SINGLE CRYSTAL OF N-TYPE GERMANIUM, ELECTROLYTICALLY EXCAVATING OPPOSED SURFACES OF SAID BASE WHICH EXTEND INWARDLY FROM SAID STRAIGHT EDGE WITH A METALLIC SALT AS THE ELECTROLYTE FOR A PREDETERMINED ETCHING INTERVAL TO FORM AN ACTIVE SEMICONDUCTIVE REGION HAVING SUBSTANTIALLY UNIFORMLY-SPACED SURFACE BARRIERS, AND ELECTROPLATING SAID SURFACE BARRIERS WITH THE METAL IONS FROM SAID METALLIC SALT FRO A PREDETERMINED PLATING INTERVAL IMMEDIATELY FOLLOWING SAID ETCHING INTERVAL.
Claim 4
Dependent Claim
87 words
IN THE MANUFACTURE OF A SURFACE-BARRIER TRANSISTOR, THE STEPS INCLUDING CUTTING A SUBSTANTIALLY RECTANGULAR GERMANIUM BASE HAVING A STRAIGHT EDGE FROM A SINGLE CRYSTAL OF N-TYPE GERMANIUM, ELECTROLYTICALLY EXCAVATING OPPOSED SURFACES OF SAID BASE WHICH EXTEND INWARDLY FROM SAID STRAIGHT EDGE WITH A METALLIC SALT AS THE ELECTROLYTE FOR A PREDETERMINED ETCHING INTERVAL TO FORM AN ACTIVE SEMICONDUCTIVE REGION HAVING SUBSTANTIALLY UNIFORMLY-SPACED SURFACE BARRIERS, AND ELECTROPLATING SAID SURFACE BARRIERS WITH THE METAL IONS FROM SAID METALLIC SALT FRO A PREDETERMINED PLATING INTERVAL IMMEDIATELY FOLLOWING SAID ETCHING INTERVAL.
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) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |