US4903104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterojunctional collector-top type bi-polar transistor
Assignee: Sony Corp
•
Filing: 1989-07-05
•
Granted: 1990-02-20
•
Expires: 2009-07-05
Abstract
Abstract A heterojunction type bi-polar transistor which has a heterojunction in the boundary between an intrinsic base region and an external base region to thereby eliminate the periphery effect and accordingly obtain a high current amplification factor.
Inventors
- 👤 Hiroji Kawai
- 👤 Kenichi Taira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:07
CPC Classifications
H; H10; H10D; H10D10/00; H10D10/80; H10D10/821
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A transistor, said transistor formed as a heterojunction collector-top type bi-polar transistor, said transistor having an emitter region, intrinsic and external base regions, and a collector region formed on a compound semiconductor substrate, and a heterojunctin structure forming a boundary between said intrinsic base region formed adjacent said external base region, wherein said transistor has a substrate, an emitter region formed on said substrate, and a collector region formed on top of said emitter region, said intrinsic base region formed between said emitter and collector regions.
Claim 2
Dependent Claim
86 words
A transistor, said transistor formed as a heterojunction collector-top type bi-polar transistor, said transistor having an emitter region, intrinsic and external base regions, and a collector region formed on a compound semiconductor substrate, and a heterojunctin structure forming a boundary between said intrinsic base region formed adjacent said external base region, wherein said transistor has a substrate, an emitter region formed on said substrate, and a collector region formed on top of said emitter region, said intrinsic base region formed between said emitter and collector regions.
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) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |