Patent US2845515A successfully refreshed from Google Patents.
US2845515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semimetallic resistive filaments
Assignee: Raytheon Co
•
Filing: 1953-03-12
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Granted: 1958-07-29
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Expires: 1973-03-12
Abstract
No abstract record available.
Inventors
- 👤 Mauritz L Anderson
- 👤 Frederick T Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:21
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A RESISTIVE FILAMENT FOR A CATHODE OF A THERMIONIC DISCHARGE DEVICE CONSISTING OF A MIXTURE OF ABOUT FORTY TO FIFTY-FIVE PERCENT OF FINELY-DIVIDED MOLYBDENUM AND THE BALANCE OF DIELECTRIC REFRACTORY PARTICLES FORMED INTO A SELF-SUPPORTING BODY AND COVERED BY AN INSULATING COATING, AND CONDUCTORS INSERTED INTO THE BODY OF THE FILAMENT AT EACH END OF SAID FILAMENT.
Claim 2
Dependent Claim
57 words
A RESISTIVE FILAMENT FOR A CATHODE OF A THERMIONIC DISCHARGE DEVICE CONSISTING OF A MIXTURE OF ABOUT FORTY TO FIFTY-FIVE PERCENT OF FINELY-DIVIDED MOLYBDENUM AND THE BALANCE OF DIELECTRIC REFRACTORY PARTICLES FORMED INTO A SELF-SUPPORTING BODY AND COVERED BY AN INSULATING COATING, AND CONDUCTORS INSERTED INTO THE BODY OF THE FILAMENT AT EACH END OF SAID FILAMENT.
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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 |