US3770516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic integrated circuits
Assignee: International Business Machines Corp
•
Filing: 1972-01-12
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Granted: 1973-11-06
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Expires: 1992-01-12
Abstract
Abstract Monolithic integrated circuits are made utilizing various ion implantation techniques for making diodes, transistors, resistors, capacitors, underpass connections, sub-collector junctions, etc., and for altering impurity profiles, gold doping, trimming resistance values, altering junctions depth, and isolating regions.
Inventors
- 👤 M Duffy
- 👤 P Schumann
- 👤 T Yeh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:21
CPC Classifications
H; H10; H10P; H10P95/00; H10D; H10D84/00; H10D84/01; H10D84/0112; H10D84/02; H10D84/03; H10D84/038; H10D99/00; H10W; H10W10/00; H10W10/01; H10W10/031; H10W10/30; H10W20/00; H10W20/01; H10W20/021
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
29 words
A semiconductor transistor structure comprising emitter, base and collector regions in a semiconductor body, and lifetime killer impurities present substantially exclusively near the collector-base junction in said semiconductor body.
Claim 2
Dependent Claim
23 words
The semiconductor structure of claim 2 wherein the said lifetime killer impurities are in an area within 1 micron from the collector-base junction.
Claim 3
Dependent Claim
13 words
The semiconductor structure of claim 2 wherein the lifetime killer impurities are gold.
Claim 4
Dependent Claim
18 words
The semiconductor structure of claim 3 wherein the semiconductor structure forms a part of a monolithic semiconductor structure.
Claim 5
Dependent Claim
19 words
The semiconductor structure of claim 3 wherein the said impurities are within the collector region of said semiconductor body.
References Cited (Backward Citations)
US3272661A
Cited
US3388009A
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US3388009B1
Cited
US3445926A
Cited
US3660171A
Cited
US3707765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |