US2798182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispenser cathode having heater embedded in densely sintered receptacle wall
Assignee: Siemens and Halske AG
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Filing: 1952-07-02
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Granted: 1957-07-02
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Expires: 1972-07-02
Abstract
No abstract record available.
Inventors
- 👤 Costa Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:47
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A HEATED DISPENSER TYPE CATHODE FOR USE IN AN ELECTRICAL DISCHARGE DEVICE COMPRISING A RECEPTACLE HAVING WALL MEANS MADE OF SINTERED MATERIAL WHICH IS SO HIGHLY SINTERED THAT IT IS SUSBSTANTIALLY IMPERMEABLE TO VAPORIZED EMISSIVE MATERIAL, A POROUS VAPOR-PERMEABLE SINTERED COVER MEMBER TIGHTLY SUBSTANTIALLY VAPOR-IMPERMEABLY SINTERED TO SAID VAPOR-IMPERMEABLE WALL MEANS OF SAID RECEPTACLE AND FORMING A CAVITY THEREWITH CONTAINING EMISSIVE MATERIAL, THE OUTSIDE OF SAID VAPOR-PERMEABLE COVER MEMBER FORMING THE EMITTING SURFACE OF SAID CATHODE, AND AN ELECRICALLY INSULATED HEATER ELEMENET COMPLETELY EMBEDDED IN PART OF SAID RECEPTACLE WALL IN HEAT CONDUCTIVE RELATIONSHIP THERETO, MEANS FOR HEATING THE RECEPTACLE FORMED THEREBY AND THE EMISSIVE MATERIAL CONTAINED THEREIN AND THE COVER MEMBER SINTERED THERETO SOLELY BE THERMAL CONDUCTION TO CAUSE MIGRATION OF SAID EMISSIVE MATERIAL SUBSTANTIALLY SOLELY THROUGH SAID POROUS VAPORPERMEABLE COVER MEMBER TO THE EMITTING SURFACE FORMED THEREBY.
Claim 2
Dependent Claim
139 words
A HEATED DISPENSER TYPE CATHODE FOR USE IN AN ELECTRICAL DISCHARGE DEVICE COMPRISING A RECEPTACLE HAVING WALL MEANS MADE OF SINTERED MATERIAL WHICH IS SO HIGHLY SINTERED THAT IT IS SUSBSTANTIALLY IMPERMEABLE TO VAPORIZED EMISSIVE MATERIAL, A POROUS VAPOR-PERMEABLE SINTERED COVER MEMBER TIGHTLY SUBSTANTIALLY VAPOR-IMPERMEABLY SINTERED TO SAID VAPOR-IMPERMEABLE WALL MEANS OF SAID RECEPTACLE AND FORMING A CAVITY THEREWITH CONTAINING EMISSIVE MATERIAL, THE OUTSIDE OF SAID VAPOR-PERMEABLE COVER MEMBER FORMING THE EMITTING SURFACE OF SAID CATHODE, AND AN ELECRICALLY INSULATED HEATER ELEMENET COMPLETELY EMBEDDED IN PART OF SAID RECEPTACLE WALL IN HEAT CONDUCTIVE RELATIONSHIP THERETO, MEANS FOR HEATING THE RECEPTACLE FORMED THEREBY AND THE EMISSIVE MATERIAL CONTAINED THEREIN AND THE COVER MEMBER SINTERED THERETO SOLELY BE THERMAL CONDUCTION TO CAUSE MIGRATION OF SAID EMISSIVE MATERIAL SUBSTANTIALLY SOLELY THROUGH SAID POROUS VAPORPERMEABLE COVER MEMBER TO THE EMITTING SURFACE FORMED THEREBY.
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) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |