Patent US3686544A successfully refreshed from Google Patents.
US3686544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mosfet with dual dielectric of titanium dioxide on silicon dioxide to prevent surface current migration path
Assignee: US Philips Corp
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Filing: 1969-02-10
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Granted: 1972-08-22
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Expires: 1989-02-10
Abstract
Abstract An insulated gate field effect transistor is described having a titanium dioxide surface layer over the usual insulating layer to interrupt surface charge migration between its source and drain.
Inventors
- 👤 Peter Edward Steigman
- 👤 Frank Robert Badcock
- 👤 David Robert Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:09
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/10; H10D62/102; H10D62/112; H10P; H10P14/00; H10P14/60; H10P14/63; H10P14/6326; H10P14/6328; H10P14/6329; H10P14/6334; H10P14/66; H10P14/662; H10P14/69; H10P14/692; H10P14/6921; H10P14/69215; H10P14/6938; H10P14/6939; H10P14/69394
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
A semiconductor device as set forth in claim 1 wherein the source and drain electrodes have a linear elongated form, and the titanium dioxide surface layer is provided at least at the area along the edges of the source and drain electrodes and just outside of the gate electrode.
Claim 2
Dependent Claim
30 words
A semiconductor device as set forth in claim 1 wherein the titanium dioxide surface layer is located on the whole surface part of the insulating layer beyond the gate electrode.
Claim 3
Dependent Claim
24 words
A semiconductor device as set forth in claim 3 wherein the titanium dioxide surface layer also extends over the source, drain and gate electrodes.
Claim 4
Dependent Claim
24 words
A semiconductor device as set forth in claim 1 wherein the semiconductor body is of silicon, and the insulating layer is of silicon oxide.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |