US2858244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 15:17
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.
References Cited (Backward Citations)
US2127388A
Cited
US2227469A
Cited
US2210850A
Cited
US2472592A
Cited
GB597754A
Cited
US2544139A
Cited
DE811901C
Cited
US2618578A
Cited
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 |