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US2703790A
Expired / Lapsed
US
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Electron emissive materials
Assignee: Raytheon Co
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Filing: 1952-08-28
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Granted: 1955-03-08
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Expires: 1972-08-28
Abstract
No abstract record available.
Inventors
- 👤 Mauritz L Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:37
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J1/142; H01J9/00; H01J9/02; H01J9/04; H01J9/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A METHOD OF PRODUCING AN EMISSIVE CATHODE COATING MATERIAL FOR THERMIONIC ELECTRON DISCHARGE DEVICES COMPRISING THE SIMULTANEOUS PRECIPITATION OF A MIXTURE CONSISTING SUBSTANTIALLY OF EIGHTY PER CENT. OF STRONTIUM CARBONATE AND TWENTY PER CENT. OF BARIUM CARBONATE FROM A SOLUTION OF SOLUBLE BARIUM AND STRONTIUM SALTS IN THE PROPER PROPORTION BY THE ADDITION OF A SOLUTION OF SODIUM AND AMMINOUM CARBONATES, SAID PRECIPITATION BEING CARRIED OUT AT A TEMPERATURE OF APPROXIMATELY 85*-90* C.
Claim 2
Independent Claim
73 words
A METHOD OF PRODUCING AN EMISSIVE CATHODE COATING MATERIAL FOR THERMIONIC ELECTRON DISCHARGE DEVICES COMPRISING THE SIMULTANEOUS PRECIPITATION OF A MIXTURE CONSISTING SUBSTANTIALLY OF EIGHTY PER CENT. OF STRONTIUM CARBONATE AND TWENTY PER CENT. OF BARIUM CARBONATE FROM A SOLUTION OF SOLUBLE BARIUM AND STRONTIUM SALTS IN THE PROPER PROPORTION BY THE ADDITION OF A SOLUTION OF SODIUM AND AMMINOUM CARBONATES, SAID PRECIPITATION BEING CARRIED OUT AT A TEMPERATURE OF APPROXIMATELY 85*-90* C.
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) | 1958-03-07 | 1958-09-06 | 1959-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-07 | 1962-09-06 | 1963-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-07 | 1966-09-06 | 1967-03-08 | $7700.00 | Window Closed / Lapsed |