Patent US3076916A successfully refreshed from Google Patents.
US3076916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impregnated tungsten cathode structures and methods for fabricating same
Assignee: Semicon Associates Inc
•
Filing: 1959-01-21
•
Granted: 1963-02-05
•
Expires: 1979-01-21
Abstract
No abstract record available.
Inventors
- 👤 Otto G Koppius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:56
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
A METHOD OF FABRICATING A MACHINED TUNGSTEN BODY OF DESIRED SHAPE AND SIZE FOR USE IN DISPENSER CATHODES COMPRISING THE STEPS OF COMPACTING TUNGSTEN PARTICLES INTO A BODY, SINTERING THE BODY TO FORM AN UNMACHINABLE SINTERED POROUS BLANK, IMPREGNATING THE BLANK WITH A FILLER PLASTIC IN FLUID FORM CAPABLE OF POLYMERIZATION AMD DEPOLYMERIZATION WITHOUT LEAVING A DEPOSIT, POLYMERIZING THE PLASTIC IMPREGNANT TO PROVIDE A LUBRICATED TUNGSTEN SURFACE, MACHING THE PLASTIC-IMPREGNATED BLANK TO THE DESIRED SHAPED AND SIZE, AND EVAPORATING THE FILLER PLASTIC AT A TEMPERATURE BELOW SAID SINTERING TEMPERATURE TO REMOVE THE FILLER PLASTIC ENTIRELY FROM THE BLANK.
Claim 2
Independent Claim
98 words
A METHOD OF FABRICATING A MACHINED TUNGSTEN BODY OF DESIRED SHAPE AND SIZE FOR USE IN DISPENSER CATHODES COMPRISING THE STEPS OF COMPACTING TUNGSTEN PARTICLES INTO A BODY, SINTERING THE BODY TO FORM AN UNMACHINABLE SINTERED POROUS BLANK, IMPREGNATING THE BLANK WITH A FILLER PLASTIC IN FLUID FORM CAPABLE OF POLYMERIZATION AMD DEPOLYMERIZATION WITHOUT LEAVING A DEPOSIT, POLYMERIZING THE PLASTIC IMPREGNANT TO PROVIDE A LUBRICATED TUNGSTEN SURFACE, MACHING THE PLASTIC-IMPREGNATED BLANK TO THE DESIRED SHAPED AND SIZE, AND EVAPORATING THE FILLER PLASTIC AT A TEMPERATURE BELOW SAID SINTERING TEMPERATURE TO REMOVE THE FILLER PLASTIC ENTIRELY FROM THE BLANK.
Claim 3
Dependent Claim
43 words
A DISPENSER CATHODE COMPRISING A POROUS BODY OF SINTERED TUNGSTEN WHOSE PORES ARE ENTIRELY FREE OF FILLER MATERIAL, AND AN EMISSIVE MATERIAL IMPREGNATING SAID PORES CONSTITUTED BY 4 MOLS OF BARIUM OXIDE, 1 MOL OF CALCIUM OXIDE AND 1 MOL OF ALUMINUM OXIDE.
Claim 4
Dependent Claim
43 words
A DISPENSER CATHODE COMPRISING A POROUS BODY OF SINTERED TUNGSTEN WHOSE PORES ARE ENTIRELY FREE OF FILLER MATERIAL, AND AN EMISSIVE MATERIAL IMPREGNATING SAID PORES CONSTITUTED BY 4 MOLS OF BARIUM OXIDE, 1 MOL OF CALCIUM OXIDE AND 1 MOL OF ALUMINUM OXIDE.
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) | 1966-02-04 | 1966-08-06 | 1967-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-04 | 1970-08-06 | 1971-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-04 | 1974-08-06 | 1975-02-05 | $7700.00 | Window Closed / Lapsed |