US3239440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic pickling of titanium and titanium base alloy articles
Assignee: Titanium Metals Corp
•
Filing: 1964-11-23
•
Granted: 1966-03-08
•
Expires: 1984-11-23
Abstract
No abstract record available.
Inventors
- 👤 Loren C Covington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:40
CPC Classifications
C; C25; C25F; C25F1/00; C25F1/02; C25F1/04; C25F1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD FOR PICKLING AN ARTICLE OF METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM AND TITANIUM BASE ALLOYS WHICH COMPRISES; IMMERSING SAID ARTICLE IN AN ELECTROLYTE AT A TEMPERATURE BETWEEN ROOM TEMPERATURE AND UP TO ABOUT 100*C., WHILE PASSING ELECTRIC CURRENT BETWEEN SAID ARTICLE AS ANODE AND A CATHODE AT A CURRENT DENSITY BASED ON THE IMMERSED ANODE SURFACE AREA OF BETWEEN ABOUT 0.55 AND 8.5 AMPERES PER SQUARE INCH, SAID ELETROLYTE CONSISTING ESSENTIALLY OF FROM 0.125 TO 1 MOLE PER LITER OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SULPHURIC ACID, SODIUM SULPHATE, POTASSIUM SULPHATE AND AMMONIUM SULPHATE, UP TO 0.33 MOLE PER LITER OF A SOLUBLE DICHROMATE, FROM 0.5 TO 1.5 MOLES PER LITER OF HYDROFLUORIC ACID, BALANCE SUBSTANTIALLY WATER.
Claim 2
Independent Claim
124 words
A METHOD FOR PICKLING AN ARTICLE OF METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM AND TITANIUM BASE ALLOYS WHICH COMPRISES; IMMERSING SAID ARTICLE IN AN ELECTROLYTE AT A TEMPERATURE BETWEEN ROOM TEMPERATURE AND UP TO ABOUT 100*C., WHILE PASSING ELECTRIC CURRENT BETWEEN SAID ARTICLE AS ANODE AND A CATHODE AT A CURRENT DENSITY BASED ON THE IMMERSED ANODE SURFACE AREA OF BETWEEN ABOUT 0.55 AND 8.5 AMPERES PER SQUARE INCH, SAID ELETROLYTE CONSISTING ESSENTIALLY OF FROM 0.125 TO 1 MOLE PER LITER OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SULPHURIC ACID, SODIUM SULPHATE, POTASSIUM SULPHATE AND AMMONIUM SULPHATE, UP TO 0.33 MOLE PER LITER OF A SOLUBLE DICHROMATE, FROM 0.5 TO 1.5 MOLES PER LITER OF HYDROFLUORIC ACID, BALANCE SUBSTANTIALLY WATER.
References Cited (Backward Citations)
US2878189A
Cited
US2780594A
Cited
US2867514A
Cited
US2829091A
Cited
US2981643A
Cited
US3006827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |