US3240978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode assembly for an electron tube
Assignee: GTE Sylvania Inc
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Filing: 1962-05-11
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Granted: 1966-03-15
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Expires: 1982-05-11
Abstract
No abstract record available.
Inventors
- 👤 Krawitz Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:36
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/485
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A CATHODE ASSEMBLY FOR AN ELECTRON TUBE EMPLOYING A HEATER ELEMENT AND A CATHODE ADAPTED TO OPERATE WITH A POTENTIAL DIFFERENCE THEREBETWEEN, SAID ASSEMBLY COMPRISING AN ELECTRICALLY INSULATING CATHODE SUPPORT BODY PROVIDED WITH A LONGITUDINAL BORE AND HAVING AN ANNULAR BEAD FORMED THEREON, A METALLIC CAP HAVING AN ACTIVE CATHODE BASE PORTION AND A RIM FORMED TO TELESCOPE OVER ONE END OF SAID BODY AND EMBRACINGLY ENGAGE SAID BEAD, SAID CATHODE BASE PORTION HAVING AN ELECTRON EMISSIVE MATERIAL ON THE EXTERIOR SURFACE THEREOF, AND A HEATER ELEMENT NEST ASSEMBLY DISPOSED WITHIN SAID BORE AND SPACED FROM SAID CAP COMPRISING AN ELECTRICALLY INSULATING, SUBSTANTIALLY CYLINDRICAL HEATER SUPPORT HAVING HEATER LEAD SAID CATHODE BASE PORTION HAVING AN ELECTRON EMISSIVE MATERIAL ON THE EXTERIOR SURFACE THEREOF, AND A HEATER ELEMENT NEST ASSEMBLY DISPOSED WITHIN SAID BORE AND SPACED FROM SAID CAP COMPRISING AN ELECTRICALLY INSULATING, SUBSTANTIALLY CYLINDRICAL HEATER SUPPORT HAVING HEATER LEAD RECEIVING APERTURES THEREIN AND AN UPPER AND LOWER SURCEIVING APERTURES.
Claim 2
Dependent Claim
159 words
A CATHODE ASSEMBLY FOR AN ELECTRON TUBE EMPLOYING A HEATER ELEMENT AND A CATHODE ADAPTED TO OPERATE WITH A POTENTIAL DIFFERENCE THEREBETWEEN, SAID ASSEMBLY COMPRISING AN ELECTRICALLY INSULATING CATHODE SUPPORT BODY PROVIDED WITH A LONGITUDINAL BORE AND HAVING AN ANNULAR BEAD FORMED THEREON, A METALLIC CAP HAVING AN ACTIVE CATHODE BASE PORTION AND A RIM FORMED TO TELESCOPE OVER ONE END OF SAID BODY AND EMBRACINGLY ENGAGE SAID BEAD, SAID CATHODE BASE PORTION HAVING AN ELECTRON EMISSIVE MATERIAL ON THE EXTERIOR SURFACE THEREOF, AND A HEATER ELEMENT NEST ASSEMBLY DISPOSED WITHIN SAID BORE AND SPACED FROM SAID CAP COMPRISING AN ELECTRICALLY INSULATING, SUBSTANTIALLY CYLINDRICAL HEATER SUPPORT HAVING HEATER LEAD SAID CATHODE BASE PORTION HAVING AN ELECTRON EMISSIVE MATERIAL ON THE EXTERIOR SURFACE THEREOF, AND A HEATER ELEMENT NEST ASSEMBLY DISPOSED WITHIN SAID BORE AND SPACED FROM SAID CAP COMPRISING AN ELECTRICALLY INSULATING, SUBSTANTIALLY CYLINDRICAL HEATER SUPPORT HAVING HEATER LEAD RECEIVING APERTURES THEREIN AND AN UPPER AND LOWER SURCEIVING APERTURES.
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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |