US3628294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a bevelled cavity in a semiconductor element
Assignee: BBC Brown Boveri AG Germany
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Filing: 1969-05-12
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Granted: 1971-12-21
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Expires: 1989-05-12
Abstract
Abstract A bevelled cavity in the periphery of a disc of semiconductor material having at least two parallel spaced PN-junctions reaching to the edge of the disc is formed by grinding out the cavity, the grinding being carried out by using separate grinding wires which are of progressively smaller diameter.
Inventors
- 👤 Gunter Sattler
- 👤 Klaus Weimann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:19
CPC Classifications
H; H10; H10P; H10P90/00; H10P90/12; H10P90/128; B; B24; B24B; B24B19/00; B24B19/02; B24B9/00; B24B9/02; B24B9/06; B24B9/065; B28; B28D; B28D5/00; B28D5/04; B28D5/045; H10P52/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
The method of producing a bevelled cavity in the noncontacted edge surface of a disc of semiconductor material as defined in claim 1 wherein the wire grinding is initiated with a wire whose diameter is greater than the thickness of the semiconductor disc, and is then continued with other grinding wires whose diameters are less than the thickness of the disc.
Claim 2
Dependent Claim
39 words
The method of producing a bevelled cavity in the noncontacted edge surface of a disc of semiconductor material as defined in claim 8 and wherein grinding agents of varying granulation are also utilized in conjunction with the wire grinding.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |