Patent US2858244A successfully refreshed from Google Patents.
US2858244A
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Oxidizing process for ferrous alloys containing at least 5% chromium
Assignee: Solar Aircraft Co
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Filing: 1954-05-14
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Granted: 1958-10-28
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Expires: 1974-05-14
Abstract
No abstract record available.
Inventors
- 👤 John V Long
- 👤 Alvin R Stetson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:40
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/48; C23C22/50; C23C22/73; C23C22/74; C23D; C23D3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A METHOD FOR CONVERTING TO AN OXIDE FILM THE EXPOSED SURFACES OF METAL ALLOYS CONTAINING AT LEAST 5% CHROMIUM COMPRISING THE STEP OF BRINGING INTO CONTACT WITH SAID SURFACES A CHROMIUM-OXYGEN COMPOUND SELECTED FROM THE GROUP CONSISTING OF CHROMIC ACID AND CHROMIUM ANHYDRIDE AT A MINIMUM TEMPERATURE OF APPROXIMATELY 1500*F., WHEREBY SAID COMPOUND DECOMPOSES TO RELEASE NASCENT OXYGEN FOR OXIDIZING SAID SURFACES AND CONVERTING THE CHROMIUM CONTENT THEREOF TO CHROMIC OXIDE.
Claim 2
Independent Claim
71 words
A METHOD FOR CONVERTING TO AN OXIDE FILM THE EXPOSED SURFACES OF METAL ALLOYS CONTAINING AT LEAST 5% CHROMIUM COMPRISING THE STEP OF BRINGING INTO CONTACT WITH SAID SURFACES A CHROMIUM-OXYGEN COMPOUND SELECTED FROM THE GROUP CONSISTING OF CHROMIC ACID AND CHROMIUM ANHYDRIDE AT A MINIMUM TEMPERATURE OF APPROXIMATELY 1500*F., WHEREBY SAID COMPOUND DECOMPOSES TO RELEASE NASCENT OXYGEN FOR OXIDIZING SAID SURFACES AND CONVERTING THE CHROMIUM CONTENT THEREOF TO CHROMIC OXIDE.
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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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |