US3409467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon carbide device
Assignee: National Research Corp
•
Filing: 1966-03-11
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Granted: 1968-11-05
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Expires: 1986-03-11
Abstract
No abstract record available.
Inventors
- 👤 Francis R Foley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:03
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/80; H10D62/83; H10D62/832; H10D62/8325; H10D64/00; H10D64/01; H10D64/011; H10D64/0111; H10D64/0115
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE PROCESS FOR FORMING LOW-RESISTANCE CONTACT WITH A SILICON CARBIDE CRYSTAL WHICH COMPRISES COATING A SURFACE OF SAID CRYSTAL TO BE CONTACTED WITH POWDERED TITANUM HYDRIDE, PLACING A BODY OF CONTACT METAL OVER SAID TITANIUM HYDRIDE COATING AND THEN FIRING THE SANDWICH THUS FORMED IN AN INERT ATMOSPHERE TO A TEMPERATURE ON THE ORDER OF 1000*C. TO MELT THE CONTACT METAL AND TO WET THE SURFACE OF THE CRYSTAL.
Claim 2
Dependent Claim
69 words
THE PROCESS FOR FORMING LOW-RESISTANCE CONTACT WITH A SILICON CARBIDE CRYSTAL WHICH COMPRISES COATING A SURFACE OF SAID CRYSTAL TO BE CONTACTED WITH POWDERED TITANUM HYDRIDE, PLACING A BODY OF CONTACT METAL OVER SAID TITANIUM HYDRIDE COATING AND THEN FIRING THE SANDWICH THUS FORMED IN AN INERT ATMOSPHERE TO A TEMPERATURE ON THE ORDER OF 1000*C. TO MELT THE CONTACT METAL AND TO WET THE SURFACE OF THE CRYSTAL.
References Cited (Backward Citations)
US3047439A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |