US4314876A
Expired / Lapsed
US
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Titanium etching solution
Assignee: Diversey Corp Canada
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Filing: 1980-03-17
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Granted: 1982-02-09
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Expires: 2000-03-17
Abstract
Abstract A method of chemically milling metal and particularly for chemically milling titanium and titanium alloys which comprises subjecting these metals to the action of an aqueous acidic medium containing ammonium bifluoride and a source of nitrate ions.
Inventors
- 👤 Lawrence N. Kremer
- 👤 Matthew A. Boehmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:25
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A method for chemically milling a metal comprising subjecting the metal to the action of a solution consisting essentially of 3 to 10 percent by weight of ammonium bifluoride, a nitrate source selected from the group consisting of nitric acid, ammonium nitrate, sodium nitrate and potassium nitrate in amount equivalent to 5 to 15 percent by weight of nitric acid, 2 to 25 percent by weight hydrochloric acid where the nitrate source is ammonium nitrate, sodium nitrate or potassium nitrate, 0 to 1 percent by weight of a wetting agent and 92 to 49 percent by weight water.
Claim 2
Independent Claim
98 words
A method for chemically milling a metal comprising subjecting the metal to the action of a solution consisting essentially of 3 to 10 percent by weight of ammonium bifluoride, a nitrate source selected from the group consisting of nitric acid, ammonium nitrate, sodium nitrate and potassium nitrate in amount equivalent to 5 to 15 percent by weight of nitric acid, 2 to 25 percent by weight hydrochloric acid where the nitrate source is ammonium nitrate, sodium nitrate or potassium nitrate, 0 to 1 percent by weight of a wetting agent and 92 to 49 percent by weight water.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein said solution is at a temperature which ranges from about 70° to 120° F.
Claim 4
Dependent Claim
10 words
The method of claim 2 wherein said metal is titanium.
Claim 5
Dependent Claim
12 words
The method of claim 3 wherein said nitrate source is nitric acid.
Claim 6
Dependent Claim
12 words
The method of claim 3 wherein said nitrate source is ammonium nitrate.
Claim 7
Dependent Claim
12 words
The method of claim 3 wherein said nitrate source is sodium nitrate.
Claim 8
Dependent Claim
12 words
The method of claim 3 wherein said nitrate source is potassium nitrate.
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) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |