US3677829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the bluing of steel surfaces
Assignee: Individual
•
Filing: 1970-09-18
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Granted: 1972-07-18
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Expires: 1990-09-18
Abstract
Abstract STEEL SURFACES CAN BE COLORED TO ANY DESIRED THE HUE BETWEEN A LIGHT VIOLET-BLUE AND A DEEP BLUE-BLACK BY SUSPENDING THE PART IN THE EFFLUENT VAPORS OBTAINED BY BOILING ANY ORGANIC COMPOUND SELECTED FROM THE GROUP IN WHICH THE BOILING TEMPERATURE THEREOF LIES BETWEEN 305*C. AND 360*C., THE COLORING ATTAINED VARYING FROM THE LIGHTER TO THE DARKER HUES IN ACCORDANCE WITH THE EXTENT TO WHICH THE BOILING POINT TEMPERATURE OF THE SELECTED ORGANIC COMPOUND EXCEEDS THE MINIMUM.
Inventors
- 👤 David Stefanye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:06
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/10; C23C8/16; C23C8/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |