US2989447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of dry electrolytic devices
Assignee: —
•
Filing: —
•
Granted: 1961-06-20
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Expires: 1978-06-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:59
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/0029; H01G9/0032; C; C25; C25D; C25D11/00; C25D11/02; C25D11/26; H01G9/004; H01G9/04; H01G9/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE METHOD OF REANODIZING A POROUS TANTALUM BODY WHICH INCLUDES A LAYER OF MANGANESE DIOXIDE IN INTIMATE CONTACT WITH THE ANODIZED SURFACE THEREOF COMPRISING THE STEPS OF IMMERSING SAID BODY IN AQUEOUS ACETIC ACID OF 76 TO 86 PERCENT CONCENTRATION BY WEIGHT, BIASING SAID BODY ANODICALLY SO THAT AN ANODIZING CURRENT FLOWS THERETHROUGH, AND MAINTAINING SAID BIAS UNTIL THE SAID ANODIZING CURRENT ATTAINS A SUBSTANTIALLY CONSTANT VALUE, REMOVING SAID BODY FROM SAID ACETIC ACID AND HEATING SAID BODY TO A TEMPERATURE AND FOR A TIME SUFFICIENT TO VOLATILIZE THE RESIDUAL ACETIC ACID CONTAINED THEREIN WHEREBY SAID RESIDUAL ACETIC ACID IS SUBSTANTIALLY ELIMINATED FROM SAID BODY.
Claim 2
Independent Claim
105 words
THE METHOD OF REANODIZING A POROUS TANTALUM BODY WHICH INCLUDES A LAYER OF MANGANESE DIOXIDE IN INTIMATE CONTACT WITH THE ANODIZED SURFACE THEREOF COMPRISING THE STEPS OF IMMERSING SAID BODY IN AQUEOUS ACETIC ACID OF 76 TO 86 PERCENT CONCENTRATION BY WEIGHT, BIASING SAID BODY ANODICALLY SO THAT AN ANODIZING CURRENT FLOWS THERETHROUGH, AND MAINTAINING SAID BIAS UNTIL THE SAID ANODIZING CURRENT ATTAINS A SUBSTANTIALLY CONSTANT VALUE, REMOVING SAID BODY FROM SAID ACETIC ACID AND HEATING SAID BODY TO A TEMPERATURE AND FOR A TIME SUFFICIENT TO VOLATILIZE THE RESIDUAL ACETIC ACID CONTAINED THEREIN WHEREBY SAID RESIDUAL ACETIC ACID IS SUBSTANTIALLY ELIMINATED FROM SAID BODY.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |