US2789153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace for producing single crystals for transistors
Assignee: Individual
•
Filing: 1956-02-28
•
Granted: 1957-04-16
•
Expires: 1976-02-28
Abstract
No abstract record available.
Inventors
- 👤 Mark Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:44
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/14; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032; Y10T117/1064; Y10T117/1068
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
AN ELECTRIC FURNACE COMPRISING AN UPRIGHT QUARTZ TUBE, INCLUDING IN ITS UPPER PORTION A REENTRANT WELL, A QUARTZ CRUCIBLE WITHIN SAID WELL AND SPACED ABOVE THE BOTTOM, AND FROM THE SIDE, OF THE WELL, A HELICAL GRAPHITE HEATER ENCLOSED WITHIN SAID TUBE AND DISPOSED AROUND AND ADJACENT SAID WELL AND ADAPTED TO BE ELECTRICALLY HEATED CONDUCTIVELY, TANTALUM ELECTRICAL CONDUCTORS CON-
Claim 2
Dependent Claim
60 words
AN ELECTRIC FURNACE COMPRISING AN UPRIGHT QUARTZ TUBE, INCLUDING IN ITS UPPER PORTION A REENTRANT WELL, A QUARTZ CRUCIBLE WITHIN SAID WELL AND SPACED ABOVE THE BOTTOM, AND FROM THE SIDE, OF THE WELL, A HELICAL GRAPHITE HEATER ENCLOSED WITHIN SAID TUBE AND DISPOSED AROUND AND ADJACENT SAID WELL AND ADAPTED TO BE ELECTRICALLY HEATED CONDUCTIVELY, TANTALUM ELECTRICAL CONDUCTORS CON-
References Cited (Backward Citations)
US2039165A
Cited
US2707719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |