US3597172A
Expired / Lapsed
US
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Alloys having an aluminum-diffused surface layer
Assignee: Deutsche Edelstahlwerke AG
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Filing: 1968-01-29
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Granted: 1971-08-03
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Expires: 1988-01-29
Abstract
Abstract IT IS KNOWN TO PROTECT THE SURFACE OF ALLOYS WITH A LAYER OF DIFFUSED ALUMINUM. IT HAS NOW BEEN FOUND THAT THE OXIDATIVE RESISTANCE OF CERTAIN ALLOYS, NAMELY HIGH TEMPERATURE STEELS, NICKEL BASED AND COBALT BASED ALLOYS, IS IMPROVED IF THE ALUMINUM LAYER IS DIFFUSED ONTO A SUBSTRATE OF NICKEL.
Inventors
- 👤 Karl Bungardt
- 👤 Gottfried Becker
- 👤 Gunter Lehnert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:01
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/04; C; C23; C23C; C23C10/00; C23C10/02; C25; C25D; C25D5/00; C25D5/48; C25D5/50; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12937
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |