Patent US5003520A successfully refreshed from Google Patents.
US2985946A
Expired / Lapsed
US
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Indirectly heated cathode
Assignee: US Philips Corp
•
Filing: 1956-05-09
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Granted: 1961-05-30
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Expires: 1976-05-09
Abstract
No abstract record available.
Inventors
- 👤 Weijer Henricus Johannes De
- 👤 Heynen Constantius Jo Henricus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:01
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 0
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US2724070A
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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) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |