Patent US3279957A successfully refreshed from Google Patents.
US3279957A
Expired / Lapsed
US
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Method of producing a black oxide coating on ferrous metals
Assignee: D J CAMPBELL CO Inc
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Filing: 1962-12-17
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Granted: 1966-10-18
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Expires: 1982-12-17
Abstract
No abstract record available.
Inventors
- 👤 Richard R Fink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:33
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A METHOD OF PRODUCING BLACK OXIDE COATING ON FERROUS ARTICLES, COMPRISING THE STEPS OF INTRODUCING A TREATING SOLUTION INTO A VESSEL, SAID TREATING SOLUTION COMPRISING A SALT COMPOSITION DISSOLVED IN WATER WITH THE WATER BEING PRESENT IN A RATIO OF 1 PART WATER TO .77 TO 1.31 PART OF SAID SALT COMPOSITION AND SAID SALT COMPOSITION COMPRISING FROM 50 TO 90% BY WEIGHT OF AN ALKALI METAL HYDROXIDE AND THE BALANCE BEING AT LEAST ONE STRONGLY OXIDIZING AGENT, IMMERSING THE FERROUS ARTICLE IN THE SOLUTION, HERMETICALLY SEALING THE VESSEL, HEATING THE SLUTION TO A TEMPERATURE OF 285* TO 308*F. WHILE MAINTAINING THE HERMETICALLY SEALED CONDITION IN SAID VESSEL FOR A PERIOD OF 10 TO 25 MINUTES, AND THEREAFTER REMOVING THE ARTICLE FROM THE TREATING SOLUTION.
Claim 2
Independent Claim
125 words
A METHOD OF PRODUCING BLACK OXIDE COATING ON FERROUS ARTICLES, COMPRISING THE STEPS OF INTRODUCING A TREATING SOLUTION INTO A VESSEL, SAID TREATING SOLUTION COMPRISING A SALT COMPOSITION DISSOLVED IN WATER WITH THE WATER BEING PRESENT IN A RATIO OF 1 PART WATER TO .77 TO 1.31 PART OF SAID SALT COMPOSITION AND SAID SALT COMPOSITION COMPRISING FROM 50 TO 90% BY WEIGHT OF AN ALKALI METAL HYDROXIDE AND THE BALANCE BEING AT LEAST ONE STRONGLY OXIDIZING AGENT, IMMERSING THE FERROUS ARTICLE IN THE SOLUTION, HERMETICALLY SEALING THE VESSEL, HEATING THE SLUTION TO A TEMPERATURE OF 285* TO 308*F. WHILE MAINTAINING THE HERMETICALLY SEALED CONDITION IN SAID VESSEL FOR A PERIOD OF 10 TO 25 MINUTES, AND THEREAFTER REMOVING THE ARTICLE FROM THE TREATING SOLUTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |