Patent US3259475A successfully refreshed from Google Patents.
US3259475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etched metal valve surfaces of tantalum or niobium or titanium
Assignee: Individual
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Filing: 1965-05-03
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Granted: 1966-07-05
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Expires: 1985-05-03
Abstract
No abstract record available.
Inventors
- 👤 Burnham John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:14
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/055; C; C25; C25F; C25F3/00; C25F3/02; C25F3/08; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431; Y10T428/12465; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12771; Y10T428/12806; Y10T428/12993; Y10T428/24; Y10T428/24355; Y10T428/24479; Y10T428/2457
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
AN ETCHED SURFACE OF AN INERT VALVE METAL SELECTED FROM THE GROUP CONSISTING OF TANTALUM, NIOBIUM AND TITANIUM, SAID SURFACE BEING SUBSTANTIALLY FREE FROM SURFACE IMPURITIES AND HAVING A SURFACE APPEARANCE RESEMBLING A SERIES OF SUBSTANTIALLY PARALLEL AND REGULAR LOCATED RIDGES AND VALLEYS, SAID RIDGE AND VALLEYS HAVING AN UNEVEN ETCHED SURFACE CONFIGURATION.
Claim 2
Dependent Claim
53 words
AN ETCHED SURFACE OF AN INERT VALVE METAL SELECTED FROM THE GROUP CONSISTING OF TANTALUM, NIOBIUM AND TITANIUM, SAID SURFACE BEING SUBSTANTIALLY FREE FROM SURFACE IMPURITIES AND HAVING A SURFACE APPEARANCE RESEMBLING A SERIES OF SUBSTANTIALLY PARALLEL AND REGULAR LOCATED RIDGES AND VALLEYS, SAID RIDGE AND VALLEYS HAVING AN UNEVEN ETCHED SURFACE CONFIGURATION.
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) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |