US3578573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of finishing parts of zirconium alloys such as for use with nuclear reactor plants
Assignee: Siemens AG
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Filing: 1968-05-07
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Granted: 1971-05-11
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Expires: 1988-05-07
Abstract
Abstract FINISHED PARTS OF ZIRCONIUM ALLOYS, SUCH AS ENVELOPE TUBES FOR NUCLEAR FUEL, ARE SURFACE TREATED BY ELECTROLYTIC POLISHING. PREFERABLY USED IS A POLISHING BATH COMPOSED OF ACETIC ACID OF ABOUT 99 TO 100% CONCENTRATION, PERCHLORIC ACID OF 40% CONCENTRATION AND HYDROCHLORIC ACID OF 37% CONCENTRATION IN A MIXING RATIO OF ABOUT 300:1 TO 10:10 TO 40 PARTS.
Inventors
- 👤 Friedrich Schweigert
- 👤 Horst Bertholdt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:57
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/16; C25F3/22; C25F3/26
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |