Patent US2744185A successfully refreshed from Google Patents.
US3720985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving adherence of emissive material in thermionic cathodes
Assignee: GTE Sylvania Inc
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Filing: 1971-06-30
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Granted: 1973-03-20
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Expires: 1991-06-30
Abstract
Abstract An application of dendritic nickel particles to a nickel containing cathode substrate to form a porous nickel is filled with potentially emissive material in one or more alternate spray passes. The nickel particles are welded to the substrate and to each other at the time the cathode is activated at a temperature in excess of the sintering temperature but below the melting temperature of the nickel particles. The procedure eliminates a separate sintering step and provides excellent adherence of the emissive material, thus reducing many arcing problems in high voltage applications.
Inventors
- 👤 W Buescher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:35
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
The invention of claim 1 wherein said spraying of said nickel particles and said potentially emissive material is alternately repeated at least once.
Claim 2
Dependent Claim
12 words
The invention of claim 1 wherein said processing temperature is about 1,100*C.
Claim 3
Dependent Claim
61 words
The invention of claim 1 wherein said first suspension comprises a nitrocellulose lacquer as a binder and a solvent therefor having a given drying time and said second suspension comprises a nitrocellulose lacquer as a binder and a different solvent therefor, said different solvent having a drying time greater than said given drying time of the solvent of said first suspension.
Claim 4
Dependent Claim
16 words
The invention of claim 4 wherein said solvent of said first suspension is methyl amyl acetate.
Claim 5
Dependent Claim
12 words
The invention of claim 5 wherein said different solvent is diethyl oxylate.
References Cited (Backward Citations)
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Cited
US2943957A
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US3110081A
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US3048146A
Cited
US3393090A
Cited
US3400294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |