US3046100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zone melting of semiconductive material
Assignee: EIDP Inc
•
Filing: 1958-01-20
•
Granted: 1962-07-24
•
Expires: 1978-01-20
Abstract
No abstract record available.
Inventors
- 👤 Willem J Siemons
- 👤 Denis G Kelemen
- 👤 Steckl Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:48
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/16; C30B13/28; C30B13/30; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1076; Y10T117/1088
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
AN IMPROVED PROCESS FOR FLOATING ZONE REFINING A HIGH-MELTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON, GERMANIUM AND BORON WHEREIN A MOLTEN ZONE IS CAUSED TO TRAVERSE A BAR OF SAID MATERIAL, WHICH COMPRISES HEATING A VERTICALLY DISPOSED BAR OF SAID MATERIAL BY ELECTRICAL RESISTANCE MEANS TO ESTABLISH AND MAINTAIN THROUGHOUT SAID BAR AN EVEN TEMPERATURE CLOSE TO THE MELTING POINT OF SAID MATERIAL BUT NOT LESS THAN 8/10 OF ITS MELTING POINT TEMPERATURE ON AN ABSOLUTE SCALE, APPLYING FOCUSED HEAT TO A PORTION OF THE BAR TO CREATE A NARROW MOLTEN ZONE COMPLETELY ACROSS SAID BAR, TRAVERSING SAID MOLTEN ZONE ALONG THE BAR WHILE MAINTAINING THE SOLID PORTIONS OF SAID BAR AT SAID EVEN TEMPERATURE BY CONTINUED RESISTANCE HEATING, DURING SAID REFINING MAINTAINING THE LIQUID-SOLID INTERFACES BETWEEN SAID MOLTEN ZONE AND SOLID PORTIONS SUBSTANTIALLY FLAT AND SAID BAR
Claim 2
Dependent Claim
140 words
AN IMPROVED PROCESS FOR FLOATING ZONE REFINING A HIGH-MELTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON, GERMANIUM AND BORON WHEREIN A MOLTEN ZONE IS CAUSED TO TRAVERSE A BAR OF SAID MATERIAL, WHICH COMPRISES HEATING A VERTICALLY DISPOSED BAR OF SAID MATERIAL BY ELECTRICAL RESISTANCE MEANS TO ESTABLISH AND MAINTAIN THROUGHOUT SAID BAR AN EVEN TEMPERATURE CLOSE TO THE MELTING POINT OF SAID MATERIAL BUT NOT LESS THAN 8/10 OF ITS MELTING POINT TEMPERATURE ON AN ABSOLUTE SCALE, APPLYING FOCUSED HEAT TO A PORTION OF THE BAR TO CREATE A NARROW MOLTEN ZONE COMPLETELY ACROSS SAID BAR, TRAVERSING SAID MOLTEN ZONE ALONG THE BAR WHILE MAINTAINING THE SOLID PORTIONS OF SAID BAR AT SAID EVEN TEMPERATURE BY CONTINUED RESISTANCE HEATING, DURING SAID REFINING MAINTAINING THE LIQUID-SOLID INTERFACES BETWEEN SAID MOLTEN ZONE AND SOLID PORTIONS SUBSTANTIALLY FLAT AND SAID BAR
References Cited (Backward Citations)
US2686864A
Cited
US2789039A
Cited
US2792317A
Cited
US2743199A
Cited
US2870309A
Cited
US2897329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-23 | 1966-01-22 | 1966-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-23 | 1970-01-22 | 1970-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-23 | 1974-01-22 | 1974-07-24 | $7700.00 | Window Closed / Lapsed |