US2830218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispenser cathodes and methods of making them
Assignee: General Electric Co
•
Filing: 1953-09-24
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Granted: 1958-04-08
•
Expires: 1973-09-24
Abstract
No abstract record available.
Inventors
- 👤 James E Beggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:37
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28; H01J9/00; H01J9/02; H01J9/04; H01J9/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A DISPENSER CATHODE COMPRISING A SINTERED INTEGRAL REFRACTORY METAL BODY HAVING A RECESS RECEIVING A QUANTITY OF THERMIONIC EMITTING MATERIAL, A SINTERED FACE PORTION CLOSING SAID RECESS, SAID FACE PORTION OF THE BODY BEING POROUS RELATIVE TO THE REMAINDER OF SAID BODY TO PROVIDE FOR THE GRADUAL EGRESS OF EMITTING MATERIAL FROM SAID RECESS.
Claim 2
Dependent Claim
54 words
A DISPENSER CATHODE COMPRISING A SINTERED INTEGRAL REFRACTORY METAL BODY HAVING A RECESS RECEIVING A QUANTITY OF THERMIONIC EMITTING MATERIAL, A SINTERED FACE PORTION CLOSING SAID RECESS, SAID FACE PORTION OF THE BODY BEING POROUS RELATIVE TO THE REMAINDER OF SAID BODY TO PROVIDE FOR THE GRADUAL EGRESS OF EMITTING MATERIAL FROM SAID RECESS.
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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) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |