US2673277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incandescible cathode and method of making the same
Assignee: Hartford National Bank and Trust Co
•
Filing: 1950-10-21
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Granted: 1954-03-23
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Expires: 1970-10-21
Abstract
No abstract record available.
Inventors
- 👤 Lemmens Hendrikus Johannes
- 👤 Jansen Marinus Jacobus
- 👤 Zaat Josephus Arnold Bernardus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:20
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/1209
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD OF MAKING A THERMIONIC CATHODE COMPRISING THE STEPS OF PLACING WITHIN AN OPEN CAVITY OF A MEMBER OF REFRACTORY METAL A SUPPLY OF ALKALINE EARTH COMPOUND SUBJECT TO DETERIORATION BY HEAT, PLACING OVER THE OPENING OF THE CAVITY OF MEMBER OF SINTERED REFRACTORY METAL HAVING A POROUS PORTION, AND LOCALLY HEATING ABUTTING SURFACE PORTIONS OF SAID MEMBERS BY PRESSING SAID MEMBERS TOGETHER WHILE PASSING THROUGH THE CONNECTION BETWEEN THE MEMBERS AN ELECTRICAL CURRENT OF SUCH INTENSITY AND DURATION AS TO FORM A FUSED JOINT WITHOUT DELETERIOUSLY AFFECTING THE ALKALINE EARTH COMPOUNDS.
Claim 2
Independent Claim
93 words
A METHOD OF MAKING A THERMIONIC CATHODE COMPRISING THE STEPS OF PLACING WITHIN AN OPEN CAVITY OF A MEMBER OF REFRACTORY METAL A SUPPLY OF ALKALINE EARTH COMPOUND SUBJECT TO DETERIORATION BY HEAT, PLACING OVER THE OPENING OF THE CAVITY OF MEMBER OF SINTERED REFRACTORY METAL HAVING A POROUS PORTION, AND LOCALLY HEATING ABUTTING SURFACE PORTIONS OF SAID MEMBERS BY PRESSING SAID MEMBERS TOGETHER WHILE PASSING THROUGH THE CONNECTION BETWEEN THE MEMBERS AN ELECTRICAL CURRENT OF SUCH INTENSITY AND DURATION AS TO FORM A FUSED JOINT WITHOUT DELETERIOUSLY AFFECTING THE ALKALINE EARTH COMPOUNDS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |