US3087874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electropolishing of titanium base alloys
Assignee: Individual
•
Filing: 1961-02-13
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Granted: 1963-04-30
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Expires: 1981-02-13
Abstract
No abstract record available.
Inventors
- 👤 Don H Greisl
- 👤 Thompson Robert Edward
- 👤 Spurgeon William Marion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:54
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/16; C25F3/22; C25F3/26
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
126 words
A PROCESS FOR ELECTROPOLISHING A TITANIUM BASE ALLOY WHICH COMPRISES THE STEPS OF IMMERSING SAID ALLOY IN AN ELECTROLYTIC SOLUTION, SAID ELECTROLYTIC SOLUTION CONSISTING ESSENTIALLY OF ABOUT 22 TO 28 GRAMS OF AMMONIUM BIFLUORIDE, ABOUT 14 ML. OF FLUOBORIC ACID, ABOUT 441 ML. OF HYDROCHLORIC ACID AND ABOUT 532 ML. OF FORMAMIDE PER LITER OF SAID SOLUTION; MAKING SAID ALLOY THE ANODE IN AN ELECTROLYTIC CIRCUIT WHICH INCLUDES SAID ELECTROLYTIC SOLUTION, A CATHODE, AND A SUITABLE SOURCE OF ELECTRIC POWER; HEATING SAID ELECTROLYTIC SOLUTION TO AN ELEVATED TEMPERATURE OF FROM ABOUT 88*F. TO 96*F.; AND PASSING AN ELECTRIC CURRENT THROUGH SAID CIRCUIT AT A CURRENT DENSITY OF ABOUT 3 TO 5 AMPERES PER SQUARE INCH FOR A TIME PERIOD OF FROM ABOUT 5 TO 10 MINUTES.
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) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |