US2583681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal contacts of which one element is silicon
Assignee: Hazeltine Research Inc
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Filing: 1947-08-06
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Granted: 1952-01-29
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Expires: 1967-08-06
Abstract
No abstract record available.
Inventors
- 👤 Brittain Francis Hugh
- 👤 Ransley Charles Eric
- 👤 Ryde John Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:02
CPC Classifications
H; H10; H10D; H10D99/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A METHOD OF MANUFACTURING A CYRSTAL RECTIFYING DEVICE OF WHICH ONE ELEMENT IS MAINLY SILICON AND THE OTHER ELEMENT IS A METAL POINT IN ABUTMENT WITH A SURFACE OF THE SILICON ELEMENT: SAID METHOD COMPRISING POLISHING THE CONTACT SURFACE OF THE SILICON ELEMENT AND ETCHING THE SAME WITH HYDROFLUORIC ACID, THEN HEATING SAID ELEMENT IN AIR ABOUT 1050* C. FOR ABOUT TWO HOURS TO FORM A LAYER OF OXIDE ON THE CONTACT SURFACE OF THE SILICON ELEMENT, AND, FINALLY, ETCHING THE OXIDIZED SURFACE WITH A SOLUTION OF FORTY PERCENT HYDROFLUORIC ACID DILUTED WITH AN EQUAL VOLUME OF WATER FOR ABOUT FIVE MINUTES TO REMOVE THE GREATER PART OF SAID OXIDE LAYER.
Claim 2
Independent Claim
111 words
A METHOD OF MANUFACTURING A CYRSTAL RECTIFYING DEVICE OF WHICH ONE ELEMENT IS MAINLY SILICON AND THE OTHER ELEMENT IS A METAL POINT IN ABUTMENT WITH A SURFACE OF THE SILICON ELEMENT: SAID METHOD COMPRISING POLISHING THE CONTACT SURFACE OF THE SILICON ELEMENT AND ETCHING THE SAME WITH HYDROFLUORIC ACID, THEN HEATING SAID ELEMENT IN AIR ABOUT 1050* C. FOR ABOUT TWO HOURS TO FORM A LAYER OF OXIDE ON THE CONTACT SURFACE OF THE SILICON ELEMENT, AND, FINALLY, ETCHING THE OXIDIZED SURFACE WITH A SOLUTION OF FORTY PERCENT HYDROFLUORIC ACID DILUTED WITH AN EQUAL VOLUME OF WATER FOR ABOUT FIVE MINUTES TO REMOVE THE GREATER PART OF SAID OXIDE LAYER.
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) | 1955-01-28 | 1955-07-30 | 1956-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-28 | 1959-07-30 | 1960-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-28 | 1963-07-30 | 1964-01-29 | $7700.00 | Window Closed / Lapsed |