US2878093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing emitter surfaces
Assignee: University of Minnesota Twin Cities
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Filing: 1955-02-14
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Granted: 1959-03-17
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Expires: 1975-02-14
Abstract
No abstract record available.
Inventors
- 👤 Wargo Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:54
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/12; H01J9/125; H01J2201/00; H01J2201/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
THE METHOD OF PREPARING SECONDARY EMITTER SURFACES FOR ELECTRON TUBES COMPRISING FORMING THE SURFACE OF A CLEANED SHAPE COMPOSED OF AN ALLOY OF MAGNESIUM AND A METAL WHICH IS LOWER ON THE ELECTROMOTIVE SALE THAN NICKEL AND IN WHICH MAGNESIUM IS SUFFICIENT SOLUBLE TO FORM AN ALLOY, MOUNTING SAID SHAPE AND ASSOCIATED ELECTRON TUBE COMPONENTS ON A SUPPORTING STRUCTURE, SEALING THE SAID MOUNTED SHAPE AND COMPONENTS IN A GAS IMPERVIOUS ENVELOPE; HEATING AND SIMULTANEOUS EVACUATING SAID ENVELOPE UNTIL IT IS OUT-GASSED, THEN ADMITTING INTO SAID ENVELOPE A FRACTION OF AN ATMOSPHERE OF CARBON DIOXIDE CONTAINING A MINOR PERCENTAGE OF CARBON MONOXIIDE, THE TEMPERATURE OF THE ENCLOSED SHAPE BEING MAINTAINED FOR A TIME SUFFICIENT TO OXIDIZE THE MAGNESIUM ON THE SURFACE OF SAID ALLOY SHAPE TO MAGNESIUM OXIDE, THEREAFTER HEATING AN EVACUATING SAID ENVELOPE UNTIL IT IS FINALLY OUT-GASSED.
Claim 2
Independent Claim
138 words
THE METHOD OF PREPARING SECONDARY EMITTER SURFACES FOR ELECTRON TUBES COMPRISING FORMING THE SURFACE OF A CLEANED SHAPE COMPOSED OF AN ALLOY OF MAGNESIUM AND A METAL WHICH IS LOWER ON THE ELECTROMOTIVE SALE THAN NICKEL AND IN WHICH MAGNESIUM IS SUFFICIENT SOLUBLE TO FORM AN ALLOY, MOUNTING SAID SHAPE AND ASSOCIATED ELECTRON TUBE COMPONENTS ON A SUPPORTING STRUCTURE, SEALING THE SAID MOUNTED SHAPE AND COMPONENTS IN A GAS IMPERVIOUS ENVELOPE; HEATING AND SIMULTANEOUS EVACUATING SAID ENVELOPE UNTIL IT IS OUT-GASSED, THEN ADMITTING INTO SAID ENVELOPE A FRACTION OF AN ATMOSPHERE OF CARBON DIOXIDE CONTAINING A MINOR PERCENTAGE OF CARBON MONOXIIDE, THE TEMPERATURE OF THE ENCLOSED SHAPE BEING MAINTAINED FOR A TIME SUFFICIENT TO OXIDIZE THE MAGNESIUM ON THE SURFACE OF SAID ALLOY SHAPE TO MAGNESIUM OXIDE, THEREAFTER HEATING AN EVACUATING SAID ENVELOPE UNTIL IT IS FINALLY OUT-GASSED.
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) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |