US2844868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of joining refractory metals
Assignee: GTE Sylvania Inc
•
Filing: 1954-06-01
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Granted: 1958-07-29
•
Expires: 1974-06-01
Abstract
No abstract record available.
Inventors
- 👤 James E Cline
- 👤 John P Jasionis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:53
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/04; H01J23/05; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/32; B23K35/322; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12069; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12861
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A METHOD OF MAKING CATHODES, INCLUDING THE STEPS OF COATING A CYLINDRICAL METAL BASE WITH A THIN LAYER OF RUTHENIUM POWDER, WRAPPING A MOLYBDENUM MESH AROUND THE COATED BASE, HEATING THE ASSEMBLY OF BASE AND MESH TO A TEMPERATURE IN THE RANGE OF 1150*C. TO 1400*C. TO FORM A PRELIMINARY BOND BETWEEN THE BASE AND MESH, AND THEREAFTER HEATING THE ASSEMBLY TO A TEMPERATURE IN THE RANGE OF 1900*C. TO 2100*C.
Claim 2
Independent Claim
71 words
A METHOD OF MAKING CATHODES, INCLUDING THE STEPS OF COATING A CYLINDRICAL METAL BASE WITH A THIN LAYER OF RUTHENIUM POWDER, WRAPPING A MOLYBDENUM MESH AROUND THE COATED BASE, HEATING THE ASSEMBLY OF BASE AND MESH TO A TEMPERATURE IN THE RANGE OF 1150*C. TO 1400*C. TO FORM A PRELIMINARY BOND BETWEEN THE BASE AND MESH, AND THEREAFTER HEATING THE ASSEMBLY TO A TEMPERATURE IN THE RANGE OF 1900*C. TO 2100*C.
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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) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |