US2719799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zone melting furnace and method of zone melting
Assignee: RCA Corp
•
Filing: 1952-11-13
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Granted: 1955-10-04
•
Expires: 1972-11-13
Abstract
No abstract record available.
Inventors
- 👤 Schuyler M Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:59
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
THE METHOD OF ZONE-MELTING A CHARGE OF MATERIAL IN A FURNACE COMPRISING FORMING SAID CHARGE INTO A VOLUME OF SUBSTANTIALLY GREATER LENGTH IN ONE DIMENSION THAN IN ITS OTHER DIMENSIONS, ESTABLISHING A PLURALITY OF OVERLAPPING HEATING ZONES ALONG SAID CHARGE, SUCCESSIVELY MELTING AND FREEZING THE RESPECTIVE PORTIONS OF SAID CHARGE IN SUCCESSIVE ZONES WHILE MAINTAINING SAID CHARGE STATIONARY IN SAID FURNACE, EACH SUCCESSIVE PORTION BEING MELTING BEFORE THE PRECEDING PORTION IS FROZEN.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |