Patent US3590471A successfully refreshed from Google Patents.
US3590471A
Expired / Lapsed
US
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Fabrication of insulated gate field-effect transistors involving ion implantation
Assignee: AT&T Inc
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Filing: 1969-02-04
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Granted: 1971-07-06
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Expires: 1989-02-04
Abstract
Abstract An insulated gate field-effect transistor is made which utilizes both Schottky barrier connections and ion-implanted zones. The resultant structure incorporates source and drain zones, which are formed by ion implantation and whose spacing is fixed by the gate electrode, and source and drain electrodes which make ohmic connection to the implanted source and drain zones and rectifying connections to unimplanted material.
Inventors
- 👤 Martin P Lepselter
- 👤 Alfred U Macrae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:47
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/80; H10D62/83; H10D64/00; H10D64/60; H10D64/62; H10D99/00; H10P; H10P95/00; H10W; H10W20/00; H10W20/40; Y; Y10; Y10S; Y10S148/00; Y10S148/053; Y10S148/139; Y10S148/145
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
23 words
The method of claim 1 in which the semiconductive wafer is monocrystalline silicon and the insulating layer includes a layer of silicon oxide.
Claim 2
Dependent Claim
27 words
The method of claim 2 in which the surface portion of the silicon wafer is N-type and the layers of the conductive material are of platinum silicide.
Claim 3
Dependent Claim
22 words
The method of claim 3 in which the ions implanted are boron and the implanted parts of the wafer are made P-type.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |