US2389060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory body of high electronic emission
Assignee: CALLITE TUNGSTEN Corp
•
Filing: 1943-08-13
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Granted: 1945-11-13
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Expires: 1963-08-13
Abstract
No abstract record available.
Inventors
- 👤 Kurtz Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:17
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/1216; Y10T428/12174; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2935
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) | 1948-11-12 | 1949-05-14 | 1949-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-11-12 | 1953-05-14 | 1953-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-11-12 | 1957-05-14 | 1957-11-13 | $7700.00 | Window Closed / Lapsed |