US3753025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indirectly heated supply cathode
Assignee: US Philips Corp
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Filing: 1971-12-01
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Granted: 1973-08-14
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Expires: 1991-12-01
Abstract
Abstract A supply cathode having a large diameter in which the emissive body is supported by a metal base plate having metal pins which are embedded in the sintered emissive body.
Inventors
- 👤 Stratum A Van
- 👤 S Loyen
- 👤 Os J Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:25
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A cathode as recited in claim 1, wherein said heating means comprises a heating element located between said base plate face and said emissive body, said heating element being located between and electrically insulated from said pins.
Claim 2
Dependent Claim
20 words
A cathode as recited in claim 1, wherein said base plate is a layer of compressed and sintered metal powder.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |