US3573176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective anodization apparatus and process
Assignee: RCA Corp
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Filing: 1968-07-19
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Granted: 1971-03-30
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Expires: 1988-07-19
Abstract
Abstract THIN FILM TANTALUM RESISTORS ARE TREATED BY SELECTIVE ANODIZATION, BY BRINGING AN ELECTROLYTE INTO CONTACT WITH THE RESISTOR TO BE TREATED AND APPLYING A VOLTAGE BETWEEN THE ELECTROLYTE AND THE RESISTOR. THE ELECTROLYTE IS DISPOSED ON A RAISED PORTION OF A BASE PLATE IN THE FORM OF A THIN LIQUID LAYER WHICH IS PREVENTED FROM EXTENDING LATERALLY BEYOND THE RAISED PORTION BY SURFACE TENSION FORCES.
Inventors
- 👤 Wilhelm H Laznovsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:57
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/005; C25D11/02; C25D11/022; C25D5/00; C25D5/02
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |