Patent US4615865A successfully refreshed from Google Patents.
US4615865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overlay coatings with high yttrium contents
Assignee: RTX Corp
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Filing: 1983-07-12
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Granted: 1986-10-07
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Expires: 2003-07-12
Abstract
Abstract Improved coating compositions are described for the protection of superalloys at elevated temperatures. The coatings of the NiCrAlY or NiCoCrAlY type are significantly improved by the use of higher levels of yttrium.
Inventors
- 👤 David S. Duvall
- 👤 Dinesh K. Gupta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:50
CPC Classifications
C; C23; C23C; C23C30/00; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/058; C23C4/00; C23C4/04; C23C4/06; C23C4/073; C30; C30B; C30B29/00; C30B29/10; C30B29/52; C30B33/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12944
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A coating gas turbine component displaying enhanced resistance to oxidation which comprises a superalloy substrate, said superalloy containing 0.1-2% Hf, and a plasma sprayed coating on the substrate, said coating consisting essentially of 10-35% Cr, 8-20% Al, 1.1-3.0% Y, 0-30% Co, balance nickel.
Claim 2
Dependent Claim
43 words
A coating gas turbine component displaying enhanced resistance to oxidation which comprises a superalloy substrate, said superalloy containing 0.1-2% Hf, and a plasma sprayed coating on the substrate, said coating consisting essentially of 10-35% Cr, 8-20% Al, 1.1-3.0% Y, 0-30% Co, balance nickel.
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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) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |