Patent US3681059A successfully refreshed from Google Patents.
US3681059A
Expired / Lapsed
US
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Nickel-chromium alloy for reformer tubes
Assignee: Hazemag Dr E Andreas KG
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Filing: 1969-12-12
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Granted: 1972-08-01
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Expires: 1989-12-12
Abstract
Abstract CARBIDE-STRENGTHENED ALLOY CONTAINING NICKEL, CHROMIUM, MOLYBDENUM AND/OR TUNGSTEN, COBALT AND NIOBIUM PROVIDES COMBINATION OF HIGH STRESS-RUPTURE STRENGTH AT ELEVATED TEMPERATURES, RESISTANCE TO CORROSION BY COMBUSTION PRODUCTS OF HYDROCARBON FUELS, GOOD WELDABILITY AND GOOD CASTABILITY AND IS PARTICULARLY SATISFACTORY FOR USE IN PRODUCTION OF GAS PLANT APPARATUS, SUCH AS REFORMER TUBES.
Inventors
- 👤 Stuart Walter Ker Shaw
- 👤 Peter John Penrice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:13
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/04; C03B37/047; C22; C22C; C22C19/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |