US3666580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical milling method and bath
Assignee: Armco Inc
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Filing: 1969-03-20
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Granted: 1972-05-30
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Expires: 1989-03-20
Abstract
Abstract CHEMICAL MILLING OF TITANIUM AND TITANIUM ALLOYS BY IMMERSING THE SAME IN A BATH COMPRISING 2% TO 7% BY VOLUME HYDROFLUORIC ACID, 1% TO 10% BY VOLUME HYDROCHLORIC ACID, WITH REAMINDER WATER, FOR SUCH TIME, AND AT SUCH TEMPERATURE AS TO REMOVE A DESIRED QUANTITY OF METAL AND YIELD A DULL SATINLIKE FINISH. FOR A BEST SURFACE FINISH, IMMERSION IN THE HYDROFLUORIC ACID-HYDROCHLORIC ACID BATH IS FOLLOWED BY IMMERSION IN A BATH COMPRISING 5% TO 20% BY VOLUME NITRIC ACID AND 2% TO 5% HYDROFLUORIC ACID, WITH REMAINDER WATER, THIS AT SUCH TEMPERATURE AND FOR SUCH TIME AS TO CLEANSE THE SURFACE WITHOUT, HOWEVER, POLISHING THE SAME.
Inventors
- 👤 John F Kreml
- 👤 John M Leibel
- 👤 George C Pierpont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:03
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/26
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |