Patent US2690409A successfully refreshed from Google Patents.
US2690409A
Expired / Lapsed
US
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Binary coating of refractory metals
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1949-07-08
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Granted: 1954-09-28
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Expires: 1969-07-08
Abstract
No abstract record available.
Inventors
- 👤 Wainer Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:34
CPC Classifications
C; C23; C23C; C23C10/00; C23C16/00; C23C8/00; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/938; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/12674; Y10T428/12736; Y10T428/12743; Y10T428/12771; Y10T428/12806; Y10T428/12826
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
THE METHOD OF PROVIDING A CORROSION RESISTANT SURFACE ON A MOLYBDENUM ARTICLE WHICH COMPRISES DEPOSITING A LAYER OF SILICON ON SAID ARTICLE, AND NITRIDING THE SILICON LAYER.
Claim 2
Independent Claim
27 words
THE METHOD OF PROVIDING A CORROSION RESISTANT SURFACE ON A MOLYBDENUM ARTICLE WHICH COMPRISES DEPOSITING A LAYER OF SILICON ON SAID ARTICLE, AND NITRIDING THE SILICON LAYER.
References Cited (Backward Citations)
US1551333A
Cited
US1929252A
Cited
US2096924A
Cited
FR842981A
Cited
US2235504A
Cited
US2294562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |