US3634216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeposition of lead dioxide
Assignee: Pacific Eng & Prod
•
Filing: 1969-06-17
•
Granted: 1972-01-11
•
Expires: 1989-06-17
Abstract
Abstract PROCESSES FOR MANUFACTURE OF LEAD DIOXIDE INVOLVING FIRST PLATING ONTO A SUBSTRATE A THIN LAYER AND, DISCONTINUOUSLY, A THICK LAYER AND REMOVING THE THICK LAYER WHILE RETAINING THE THIN LAYER ONTO WHICH A THICK LAYER MAY AGAIN REPEATEDLY BE PLATED. THE ELECTROLYTE CONTAINS LEAD NITRATE AND NITRIC ACID HAVING A CONCENTRATION OF ABOUT 5 TO ABOUT 20 GRAMS OF FREE ACID PER LITER AND TREATING THE ELECTROLYTE TO REDUCE ITS IRON CONTENT TO BELOW 0.2 GRAM PER LITER CALCULATED AS FREE IRON.
Inventors
- 👤 Fred D Gibson Jr
- 👤 Bruce B Halker
- 👤 Robert L Thayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:04
CPC Classifications
C; C01; C01G; C01G21/00; C01G21/02; C01G21/08; C01P; C01P2004/00; C01P2004/60; C01P2004/61
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |