US2904479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic polishing of zirconium, hafnium and their alloys
Assignee: Unifrax I LLC
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Filing: 1956-04-24
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Granted: 1959-09-15
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Expires: 1976-04-24
Abstract
No abstract record available.
Inventors
- 👤 Andrew T Mccord
- 👤 Donald R Spink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:10
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/16; C25F3/22; C25F3/26
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
A PROCESS OF ANODICALLY POLISHING A METAL SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM, HAFNIUM, AND THEIR ALLOYS COMPRISING IMMERSING THE METAL IN A CONCENTRATED SOLUTION OF AMMONIUM FLUORIDE AS THE ELECTROLYTE, MAKING SAID METAL THE ANODE IN AN ELECTROLYTIC CIRCUIT INCLUDING SAID ELECTROLYTE, AND PASSING A DIRECT ELECTRIC CURRENT THROUGH SAID CIRCUIT AT A SUFFICIENT ANODIC CURRENT DENSITY AND FOR SUFFICIENT LENGTH OF TIME TO EFFECT POLISHING OF THE METAL.
References Cited (Backward Citations)
GB294237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |