US2798010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing indirectly heated cathodes
Assignee: GTE Sylvania Inc
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Filing: 1955-05-23
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Granted: 1957-07-02
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Expires: 1975-05-23
Abstract
No abstract record available.
Inventors
- 👤 Bender Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:07
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN A METHOD OF MANUFACTURING AN INDIRECTLY HEATED CATHODE, THE STEPS OF DEPOSITING CERAMIC PARTICLES HAVING LOW ELECTRICAL CONDUCTIVITY OUT OF LIQUID MEDIA ONTO THE SURFACE OF A REFRACTORY METALLIC HEATER ELEMENT; HEATING THE RESULTANT STRUCTURE IN AN OXYGEN FREE ATMOSPHERE UNTIL A SINTERED SOMEWHAT POROUS CERAMIC LAYER WELL BONDED TO SAID SURFACE IS FORMED; COATING SAID CERAMIC LAYER WITH LACQUER TO SEAL OFF THE PORES THEREOF; DEPOSITING MATALLIC PARTICLES OUT OF LIQUID MEDIA ONTO THE CERAMIC LAYER; AND HEATING THE RESULTING STRUCTURE IN AN OXYGEN FREE ATMOSPHERE UNTIL A SINTERED METALLIC SHEATH IS FORMED, SAID SHEATH BEING WELL BONDED TO SAID CERAMIC LAYER AND SEALING OFF THE PORES THEREOF.
Claim 2
Dependent Claim
110 words
IN A METHOD OF MANUFACTURING AN INDIRECTLY HEATED CATHODE, THE STEPS OF DEPOSITING CERAMIC PARTICLES HAVING LOW ELECTRICAL CONDUCTIVITY OUT OF LIQUID MEDIA ONTO THE SURFACE OF A REFRACTORY METALLIC HEATER ELEMENT; HEATING THE RESULTANT STRUCTURE IN AN OXYGEN FREE ATMOSPHERE UNTIL A SINTERED SOMEWHAT POROUS CERAMIC LAYER WELL BONDED TO SAID SURFACE IS FORMED; COATING SAID CERAMIC LAYER WITH LACQUER TO SEAL OFF THE PORES THEREOF; DEPOSITING MATALLIC PARTICLES OUT OF LIQUID MEDIA ONTO THE CERAMIC LAYER; AND HEATING THE RESULTING STRUCTURE IN AN OXYGEN FREE ATMOSPHERE UNTIL A SINTERED METALLIC SHEATH IS FORMED, SAID SHEATH BEING WELL BONDED TO SAID CERAMIC LAYER AND SEALING OFF THE PORES THEREOF.
References Cited (Backward Citations)
US2112969A
Cited
US2711390A
Cited
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 |