US3389285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grid electrode having a barrier layer of metal carbide and a surface coating of metal boride thereon
Assignee: International Standard Electric Corp
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Filing: 1965-08-26
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Granted: 1968-06-18
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Expires: 1985-08-26
Abstract
No abstract record available.
Inventors
- 👤 Thomson Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:29
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/30; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/002; H01J2893/0022; H01J2893/0023
Claims Analysis
Total Claims: 0
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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) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |