US3170018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature furnace
Assignee: NUCLEAR TECHNICAL SERVICE Corp
•
Filing: 1960-05-03
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Granted: 1965-02-16
•
Expires: 1980-05-03
Abstract
No abstract record available.
Inventors
- 👤 John G Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:28
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/0006; F; F27; F27D; F27D1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
IN AN ELECTRIC RESISTANCE FURNACE HAVING A HEATER TUBE DEFINING THEREIN A HEATING ZONE, AN ANNULAR HEAT RADIATION SHIELDING MEMBER ENCIRCLING SAID TUBE COMPRISING A RIGID STRUCTURE HAVING A PLURALITY OF THIN, CONCENTRIC, GRAPHITE SLEEVES SECURED IN CLOSE, SPACED RELATIONSHIP BY A PLURALITY OF GRAPHITE STUDS THREADEDLY CONNECTED TO SAID SLEEVES.
Claim 2
Dependent Claim
51 words
IN AN ELECTRIC RESISTANCE FURNACE HAVING A HEATER TUBE DEFINING THEREIN A HEATING ZONE, AN ANNULAR HEAT RADIATION SHIELDING MEMBER ENCIRCLING SAID TUBE COMPRISING A RIGID STRUCTURE HAVING A PLURALITY OF THIN, CONCENTRIC, GRAPHITE SLEEVES SECURED IN CLOSE, SPACED RELATIONSHIP BY A PLURALITY OF GRAPHITE STUDS THREADEDLY CONNECTED TO SAID SLEEVES.
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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) | 1968-02-16 | 1968-08-17 | 1969-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-16 | 1972-08-17 | 1973-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-16 | 1976-08-17 | 1977-02-16 | $7700.00 | Window Closed / Lapsed |