Patent US3902188A successfully refreshed from Google Patents.
US3902188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency transistor
Assignee: RCA Corp
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Filing: 1973-08-15
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Granted: 1975-08-26
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Expires: 1993-08-15
Abstract
Abstract The transistor comprises a number of spaced apart emitter sites within a semiconductor wafer connected together by metal contacts overlying the wafer surface. Each emitter site comprises two sections which extend transversely of one another, the configuration of the sites contributing to a greater emitter peripheral length while not increasing the base area. The connection to each emitter site is through a layer of resistive material overlying the wafer surface, the resistive material layer providing ballasting for each site and being so arranged relative to each site to provide relatively uniform ballasting of each portion of each site.
Inventors
- 👤 David Stanley Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:12
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/10; H10D62/13; H10D62/133; H10D62/135; Y; Y10; Y10S; Y10S148/00; Y10S148/02; Y10S148/055; Y10S148/122; Y10S148/136
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
A TRANSFER COMPRISING: A BODY SEMICONDUCTOR MATERIAL HAVING A SURFACE, A NUMBER OF SPACED APART EMITTER SITES AND A BASE REGION SURROUNDING, AT SAID SURFACE, EACH OF SAID EMMITER SITES, EACH SAID EMITTER SITE BEING GENERALLY IN THE SHAPE OF THE LETTER H, INCLUDING A PAIR OF SIDE-BY-SIDE ELONGATED BRANCHES, AND A TRANSVERSE BRANCH JOINING SAID ELONGATED BRANCHES INDERMEDIATE THE ENDS THEREOF, A LAYER OF ELECTRICALLY RESISTIVE MATERIAL OVERLYING AND IN CONTACT WITH SURFACE PORTIONS OF SAID EMITTER BRANCHES, AND A METAL CONTACT OVERLYING SAID RESISTIVE LAYER, SPACED APART PORTIONS OF SAID RESISTIVE LAYER BEING CONTACTED BY SAID METAL CONTACT, SAID METAL-CONTACTED RESISTIVE LAYER PORTIONS BEING DISPOSED BETWEEN SAID ELONGATED BRANCHES AND SPACED FROM SAID TRANSVERSE BRANCH, THE SPACING BETWEEN THE EDGES OF SAID METAL-CONTACTED REISISTIVE LAYER PORTIONS AND THE EDGES OF SAID ELONGATED BRANCHES BEING ABOUT ONE HALF THE SPACING BETWEEN THE EDGES OF SAID METAL-CONTACTED RESISTIVE LAYER PORTIONS AND THE EDGES OF SAID TRANSVERSE BRANCH TO PROVIDE UNIFROM BALLASTING OVER THE EXTENT OF SAID BRANCHES,
Claim 2
Dependent Claim
167 words
A TRANSFER COMPRISING: A BODY SEMICONDUCTOR MATERIAL HAVING A SURFACE, A NUMBER OF SPACED APART EMITTER SITES AND A BASE REGION SURROUNDING, AT SAID SURFACE, EACH OF SAID EMMITER SITES, EACH SAID EMITTER SITE BEING GENERALLY IN THE SHAPE OF THE LETTER H, INCLUDING A PAIR OF SIDE-BY-SIDE ELONGATED BRANCHES, AND A TRANSVERSE BRANCH JOINING SAID ELONGATED BRANCHES INDERMEDIATE THE ENDS THEREOF, A LAYER OF ELECTRICALLY RESISTIVE MATERIAL OVERLYING AND IN CONTACT WITH SURFACE PORTIONS OF SAID EMITTER BRANCHES, AND A METAL CONTACT OVERLYING SAID RESISTIVE LAYER, SPACED APART PORTIONS OF SAID RESISTIVE LAYER BEING CONTACTED BY SAID METAL CONTACT, SAID METAL-CONTACTED RESISTIVE LAYER PORTIONS BEING DISPOSED BETWEEN SAID ELONGATED BRANCHES AND SPACED FROM SAID TRANSVERSE BRANCH, THE SPACING BETWEEN THE EDGES OF SAID METAL-CONTACTED REISISTIVE LAYER PORTIONS AND THE EDGES OF SAID ELONGATED BRANCHES BEING ABOUT ONE HALF THE SPACING BETWEEN THE EDGES OF SAID METAL-CONTACTED RESISTIVE LAYER PORTIONS AND THE EDGES OF SAID TRANSVERSE BRANCH TO PROVIDE UNIFROM BALLASTING OVER THE EXTENT OF SAID BRANCHES,
References Cited (Backward Citations)
US3214652A
Cited
US3462658A
Cited
US3582726A
Cited
US3609474A
Cited
US3602780A
Cited
US3746949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |