US3647654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beryllium-copper electropolishing solution
Assignee: Raytheon Co
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Filing: 1969-10-15
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Granted: 1972-03-07
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Expires: 1989-10-15
Abstract
Abstract AN AQUEOUS ELECTROLYTE FOR LEVELING AND POLISHING A BERYLLIUM-COPPER SURFACE, SAID ELECTROLYTE COMPRISING PHOSPHORIC ACID, CHROMIC ACID, A MAXIMUM OF 44 ML./LITER OF SULFURIC ACID, 12 TO 22 ML./LITER OF FLUOBORIC ACID AND A MAXIMUM OF 22 ML./LITER OF HYDROFLUORIC ACID.
Inventors
- 👤 Emil Toledo
- 👤 Dennis R Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:12
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/16; C25F3/22
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |