Patent US3054709A successfully refreshed from Google Patents.
US3054709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of wafers of semiconductor material
Assignee: ASS ELECT IND WOOLWICH Ltd
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Filing: 1959-06-03
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Granted: 1962-09-18
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Expires: 1979-06-03
Abstract
No abstract record available.
Inventors
- 👤 Freestone Roland
- 👤 Weir Mary Teresa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:20
CPC Classifications
H; H10; H10P; H10P90/00; H10P90/12; B; B28; B28D; B28D5/00; B28D5/0005; B28D5/0011; C; C23; C23F; C23F1/00; C23F1/02; C30; C30B; C30B33/00; H10P95/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/4979
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
THE PROCESS OF SEPARATING INTO SECTIONS OF SLICE OF MON-CRYSTALLINE GERMANIUM WHICH CONSISTS IN CUTTING A SLICE FROM AN INGOT OF MON-CRYSTALLINE GERMANIUM, SAID SLICE BEING CUT ALONG A PLANE SUBSTANTIALLY PARALLEL TO A 1.1.1. PLANE OF SAID CRYSTAL, SCRIBING ON SAID SLICE A RECTANGULAR PATTERN REPRESENTING THE LINES OF SEPARATION BETWEEN DESIRED SECTIONS, SO AS TO INTRODUCE STRAIN INTO THE SCRIBED REGIONS OF THE CRYSTAL, ETCHING SAID SLICE BY AN ETCHING BATH WHICH PREFERENTIALLY ATTACKS THE STRAINED REGIONS OF SAID SEMI-CONDUCTOR MATERIAL IN THE VICINITY OF THE SCRIBED LINES UNTIL SAID SLICE BREAKS INTO SECTIONS DETERMINED BY SAID PATTERN AND CONTINUING THE ETCHING UNTIL THE SECTIONS HAVE ATTAINED A PRESCRIBED THICKNESS.
Claim 2
Dependent Claim
112 words
THE PROCESS OF SEPARATING INTO SECTIONS OF SLICE OF MON-CRYSTALLINE GERMANIUM WHICH CONSISTS IN CUTTING A SLICE FROM AN INGOT OF MON-CRYSTALLINE GERMANIUM, SAID SLICE BEING CUT ALONG A PLANE SUBSTANTIALLY PARALLEL TO A 1.1.1. PLANE OF SAID CRYSTAL, SCRIBING ON SAID SLICE A RECTANGULAR PATTERN REPRESENTING THE LINES OF SEPARATION BETWEEN DESIRED SECTIONS, SO AS TO INTRODUCE STRAIN INTO THE SCRIBED REGIONS OF THE CRYSTAL, ETCHING SAID SLICE BY AN ETCHING BATH WHICH PREFERENTIALLY ATTACKS THE STRAINED REGIONS OF SAID SEMI-CONDUCTOR MATERIAL IN THE VICINITY OF THE SCRIBED LINES UNTIL SAID SLICE BREAKS INTO SECTIONS DETERMINED BY SAID PATTERN AND CONTINUING THE ETCHING UNTIL THE SECTIONS HAVE ATTAINED A PRESCRIBED THICKNESS.
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) | 1965-09-17 | 1966-03-19 | 1966-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-17 | 1970-03-19 | 1970-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-17 | 1974-03-19 | 1974-09-18 | $7700.00 | Window Closed / Lapsed |