US2900281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bonding metal borides to graphite
Assignee: General Electric Co
•
Filing: 1953-07-20
•
Granted: 1959-08-18
•
Expires: 1973-07-20
Abstract
No abstract record available.
Inventors
- 👤 William R Grams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:38
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
THE METHOD OF MAKING A THERMIONIC CATHODE WHICH COMPRISES PLACING AN AMOUNT OF A METAL BORIDE ELECTRON EMITTING MATERIAL ON A GRAPHITE HOLER, HEATING THE BORIDE AT A LOCALIZED PORTION UNTIL IT BEGINS TO MELT, FURTHER HEAT-
Claim 2
Independent Claim
37 words
THE METHOD OF MAKING A THERMIONIC CATHODE WHICH COMPRISES PLACING AN AMOUNT OF A METAL BORIDE ELECTRON EMITTING MATERIAL ON A GRAPHITE HOLER, HEATING THE BORIDE AT A LOCALIZED PORTION UNTIL IT BEGINS TO MELT, FURTHER HEAT-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |