US3677815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making an electrolytic anode
Assignee: Engelhard Minerals and Chemicals Corp
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Filing: 1971-05-20
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Granted: 1972-07-18
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Expires: 1991-05-20
Abstract
Abstract AN IMPROVED ANODE FOR THE ELECTROLYSIS OF BRINES, COMPRISED OF A CORROSION RESISTANT VALVE METAL SUBSTRATE, A THIN POROUS ADHERENT EXTERIOR COATING SILICA, AND BETWEEN THE SUBSTRATE AND EXTERIOR COATING A THIN LAYER OF RUTHENIUM OXIDE, IS PREFERABLY PREPARED BY APPLYING A HYDROPHILIC COLLOIDAL SOLUTION OF SILICA ON THE RUTHENIUM OXIDE AND FIRING THE COATING.
Inventors
- 👤 Carl D Keith
- 👤 Alfred J Haley Jr
- 👤 Robert M Kero
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:02
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249969
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |