US2899592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
coppola
Assignee: —
•
Filing: —
•
Granted: 1959-08-11
•
Expires: 1976-08-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:24
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A THERMIONIC CATHODE COMPRISING A STRUCTURE CONSISTING OF REFRACTORY METAL, A PORTION OF THE WALL OF SAID STRUCTURE CONSTITUTING THE EMISSIVE SURFACE THEREOF CONSISTING OF A HOMOGENOUSLY-POROUS SINTERED REFRACTRORY METAL ALLOY, AND A SUPPLY OF A FUSED MIXTURE OF 5 MOLES OF BARIUM OXIDE AND 2 MOLES OF ALUMINUM OXIDE DISTRIBUTED WITHIN AND ONLY WITHIN THE PORES OF SAID WALL PORTIONS AND IN INTIMATE REACTIVE RELATIONSHIP WITH SAID REFRACTORY METAL ALLOY, SAID REFRACTORY METAL ALLOY CONSISTING OF 75% BY WEIGHT OF MOLYBDENM AND 25% BY WEIGHT OF TUNGSTEN.
Claim 2
Dependent Claim
88 words
A THERMIONIC CATHODE COMPRISING A STRUCTURE CONSISTING OF REFRACTORY METAL, A PORTION OF THE WALL OF SAID STRUCTURE CONSTITUTING THE EMISSIVE SURFACE THEREOF CONSISTING OF A HOMOGENOUSLY-POROUS SINTERED REFRACTRORY METAL ALLOY, AND A SUPPLY OF A FUSED MIXTURE OF 5 MOLES OF BARIUM OXIDE AND 2 MOLES OF ALUMINUM OXIDE DISTRIBUTED WITHIN AND ONLY WITHIN THE PORES OF SAID WALL PORTIONS AND IN INTIMATE REACTIVE RELATIONSHIP WITH SAID REFRACTORY METAL ALLOY, SAID REFRACTORY METAL ALLOY CONSISTING OF 75% BY WEIGHT OF MOLYBDENM AND 25% BY WEIGHT OF TUNGSTEN.
References Cited (Backward Citations)
US1954474A
Cited
US2085605A
Cited
US2121589A
Cited
US2147447A
Cited
US2180988A
Cited
US2389060A
Cited
US2473550A
Cited
US2543728A
Cited
US2741717A
Cited
US2700118A
Cited
US2716716A
Cited
US2700000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |