Patent US3764996A successfully refreshed from Google Patents.
Patent US3280391A successfully refreshed from Google Patents.
US3280391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency transistors
Assignee: Fairchild Semiconductor Corp
•
Filing: 1964-01-31
•
Granted: 1966-10-18
•
Expires: 1984-01-31
Abstract
No abstract record available.
Inventors
- 👤 Charles A Bittmann
- 👤 Sah Chih-Tang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:31
CPC Classifications
H; H10; H10D; H10D99/00; H10P; H10P14/00; H10P14/40; H10P14/46; H10P95/00; H10W; H10W20/00; H10W20/40; Y; Y10; Y10S; Y10S148/00; Y10S148/139
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
A TRANSISTOR COMPRISING: AMONOCRYSTALLINE BODY OF SEMICONDUCTOR MATERIAL HAVING A COLLECTOR REGION OF ONE CONDUCTIVITY TYPE AND A THIN DIFFUSED BASE REGION OF THE OPPOSITE CONDUCTIVITY TYPE HAVING A COMMON, PLANAR UPPER SURFACE AND FORMING A PN JUNCTION WITH SAID COLLECTOR REGION; SEPARATE OHMIC ELECTRICAL CONTACTS WITH EACH OF SAID BASE AND COLLECTOR REGIONS; AND A METAL EMITTER IN CONTACT WITH SAID COMMON UPPER SURFACE OF SAID BASE REGION, THE METAL OF SAID EMITTER FORMING A METAL-BARRIER RECTIFYING CONTACT WITH SAID BASE REGION WITHOUT BEING ALLOYED TO SAID BASE REGION.
References Cited (Backward Citations)
US2701326A
Cited
US2946709A
Cited
US2947925A
Cited
US2952896A
Cited
US2944321A
Cited
US3226798A
Cited
US3221220A
Cited
US3215908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |