Patent US3213004A successfully refreshed from Google Patents.
US3213004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface preparation of platinum group metals for electrodeposition
Assignee: American Potash and Chemical Corp
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Filing: 1961-03-08
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Granted: 1965-10-19
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Expires: 1981-03-08
Abstract
No abstract record available.
Inventors
- 👤 Francis J Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:01
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN THE METHOD FOR ELECTROLYTICALLY DEPOSITING A COATING OF LEAD DIOXIDE ON A PLATINUM SURFACE THE IMPROVEMENT WHICH COMPRISES, MAKING THE PLATINUM SURFACE AN ELECTRODE IN AN ELECROLYTE COMPRISING A SOLUTION OF AN OXIDIZING ACID, EXPOSING SAID PLATINUM SURFACE WHILE IN SAID ELECTROLYTE TO PERIODICALY REVERSED CURRENT AT A CURRENT DENSITY OF FROM 10 TO 80 A.S.F., THE LAST HALF-CYCLE OF SAID PERIODICALLY REVERSED CURRENT BEING ANODIC TO ANODIZE AID PLATINUM SURFACE, AND THEN ELECTROLYTICALLY DEPOSITING AN ANODIC COATING OF LEAD DIOXIDE UPON SAID ANODIZED SURFACE.
Claim 2
Dependent Claim
86 words
IN THE METHOD FOR ELECTROLYTICALLY DEPOSITING A COATING OF LEAD DIOXIDE ON A PLATINUM SURFACE THE IMPROVEMENT WHICH COMPRISES, MAKING THE PLATINUM SURFACE AN ELECTRODE IN AN ELECROLYTE COMPRISING A SOLUTION OF AN OXIDIZING ACID, EXPOSING SAID PLATINUM SURFACE WHILE IN SAID ELECTROLYTE TO PERIODICALY REVERSED CURRENT AT A CURRENT DENSITY OF FROM 10 TO 80 A.S.F., THE LAST HALF-CYCLE OF SAID PERIODICALLY REVERSED CURRENT BEING ANODIC TO ANODIZE AID PLATINUM SURFACE, AND THEN ELECTROLYTICALLY DEPOSITING AN ANODIC COATING OF LEAD DIOXIDE UPON SAID ANODIZED SURFACE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |