US4144022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace rollers
Assignee: Cyprus Amax Minerals Co
•
Filing: 1977-04-11
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Granted: 1979-03-13
•
Expires: 1997-04-11
Abstract
Abstract Conveying rollers for roller-hearth furnaces and the shafts upon which the rollers are mounted are made of molybdenum. The rollers can be either cylindrical or of the disc type. Molybdenum conveying rollers and shafts can be used at temperatures above 1200° C. in reducing atmospheres without distorting or cracking.
Inventors
- 👤 Ronald S. Fusco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:16
CPC Classifications
F; F27; F27D; F27D3/00; F27D3/02; F27D3/026
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
46 words
In a roller-hearth furnace for treating metals in reducing atmospheres, which furnace includes a heating chamber, rotatable shafts extending across the heating chamber, rollers mounted on the shaft, and means for rotating the shafts, the improvement which comprises rotatable metallic molybdenum shafts and metallic molybdenum rollers.
Claim 2
Dependent Claim
46 words
In a roller-hearth furnace for treating metals in reducing atmospheres, which furnace includes a heating chamber, rotatable shafts extending across the heating chamber, rollers mounted on the shaft, and means for rotating the shafts, the improvement which comprises rotatable metallic molybdenum shafts and metallic molybdenum rollers.
Claim 3
Dependent Claim
14 words
The improvement described in claim 1 wherein the roller is a cylindrical molybdenum tube.
Claim 4
Dependent Claim
19 words
The improvement described in claim 1 wherein the roller comprises a series of separated discs mounted on the shaft.
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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) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |