Patent US3528166A successfully refreshed from Google Patents.
Patent US3210165A successfully refreshed from Google Patents.
US3210165A
Expired / Lapsed
US
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Zone-melting treatment of semiconductive materials
Assignee: US Philips Corp
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Filing: 1961-12-29
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Granted: 1965-10-05
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Expires: 1981-12-29
Abstract
No abstract record available.
Inventors
- 👤 Adrianus Martinus Jac Gerardus
- 👤 Steinemann Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:56
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/10; C30B29/40; C30B29/42; C22; C22B; C22B41/00; C22F; C22F1/00; C22F1/16; C30B11/00; C30B13/00; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10S117/911
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A METHOD OF ZONE-MELTING A SEMICONDUCTIVE MATERIAL IN A CLOSED ENVIRONMENT IN WHICH MAY BE PRESENT UNDESIRABLE IMPURITIES WHICH TEND TO COMBINE WITH THE SEMICONDUCTIVE MATERIAL WHEN THE LATTER IS MELTED, COMPRISING PROVIDING IN THE SAID CLOSED ENVIRONMENT A QUANTITY OF SAID MATERIAL TO BE SUBJECTED TO THE SAID ZONE-MELTING IN THE FORM OF AN ELONGATED CHARGE, FIRST MELTING A ZONE OF THE CHARGE CONFINED TO ONE END OF THE CHARGE SO THAT COMBINATION WITH THE UNDESIRABLE IMPURITIES OCCURS UNTIL THE SAID UNDESIRABLE IMPURITIES IN THE ENVIRONMENT ARE TIED UP SUBSTANTIALLY ONLY IN SAID ONE END OF THE CHARGE, TERMINATING THE FIRST MELTING OF THE ZONE AT SAID ONE END, AND THEREAFTER FORMING IN THE END OF THE CHARGE OPPOSITE TO SAID ONE END A SECOND MOLTEN ZONE AND CAUSING THE SECOND MOLTEN ZONE TO TRAVERSE THE CHARGE TOWARD THE SAID ONE END ENABLING THE LATTER ZONE-MELTING TO BE CARRIED OUT IN AN ENVIRONMENT SUBSTANTIALLY FREED OF THE SAID UNDESIRABLE IMPURITIES BY THE MELTING OF THE FIRST ZONE.
Claim 2
Independent Claim
168 words
A METHOD OF ZONE-MELTING A SEMICONDUCTIVE MATERIAL IN A CLOSED ENVIRONMENT IN WHICH MAY BE PRESENT UNDESIRABLE IMPURITIES WHICH TEND TO COMBINE WITH THE SEMICONDUCTIVE MATERIAL WHEN THE LATTER IS MELTED, COMPRISING PROVIDING IN THE SAID CLOSED ENVIRONMENT A QUANTITY OF SAID MATERIAL TO BE SUBJECTED TO THE SAID ZONE-MELTING IN THE FORM OF AN ELONGATED CHARGE, FIRST MELTING A ZONE OF THE CHARGE CONFINED TO ONE END OF THE CHARGE SO THAT COMBINATION WITH THE UNDESIRABLE IMPURITIES OCCURS UNTIL THE SAID UNDESIRABLE IMPURITIES IN THE ENVIRONMENT ARE TIED UP SUBSTANTIALLY ONLY IN SAID ONE END OF THE CHARGE, TERMINATING THE FIRST MELTING OF THE ZONE AT SAID ONE END, AND THEREAFTER FORMING IN THE END OF THE CHARGE OPPOSITE TO SAID ONE END A SECOND MOLTEN ZONE AND CAUSING THE SECOND MOLTEN ZONE TO TRAVERSE THE CHARGE TOWARD THE SAID ONE END ENABLING THE LATTER ZONE-MELTING TO BE CARRIED OUT IN AN ENVIRONMENT SUBSTANTIALLY FREED OF THE SAID UNDESIRABLE IMPURITIES BY THE MELTING OF THE FIRST ZONE.
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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |