Patent US3212858A successfully refreshed from Google Patents.
US3212858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing crystalline semiconductor material
Assignee: Westinghouse Electric Corp
•
Filing: 1963-01-28
•
Granted: 1965-10-19
•
Expires: 1983-01-28
Abstract
No abstract record available.
Inventors
- 👤 Walter J Smith
- 👤 Donald R Hamilton
- 👤 Jacob J Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:55
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/14; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032; Y10T117/1068
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
IN A FURNACE FOR THE PREPARATON OF CRYSTALLINE SEMICONDUCTOR MATERIAL FROM A SUPERCOOLED MELT, A CRUCIBLE FOR CONTAINING THE MELT, A MEMBER DISPOSED OVER AND COVERING THE TOP OF SAID CRUCIBLE, SAID MEMBER HAVING A CENTRAL OPENING AND ARCUATE OPENINGS SPACED UNIFORMLY ABOUT SAID CENTRAL OPENING, AND A HEATING COIL DISPOSED ABOUT SAID CRUCIBLE, SAID HEATING COIL HAVING ITS UPPER TURNS SPACED FARTHER APART THAN ITS LOWER TURNS.
Claim 2
Dependent Claim
68 words
IN A FURNACE FOR THE PREPARATON OF CRYSTALLINE SEMICONDUCTOR MATERIAL FROM A SUPERCOOLED MELT, A CRUCIBLE FOR CONTAINING THE MELT, A MEMBER DISPOSED OVER AND COVERING THE TOP OF SAID CRUCIBLE, SAID MEMBER HAVING A CENTRAL OPENING AND ARCUATE OPENINGS SPACED UNIFORMLY ABOUT SAID CENTRAL OPENING, AND A HEATING COIL DISPOSED ABOUT SAID CRUCIBLE, SAID HEATING COIL HAVING ITS UPPER TURNS SPACED FARTHER APART THAN ITS LOWER TURNS.
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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |