US2441987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excitation system for vapor electric valves
Assignee: Westinghouse Electric Corp
•
Filing: 1944-07-07
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Granted: 1948-05-25
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Expires: 1964-07-07
Abstract
No abstract record available.
Inventors
- 👤 John L Boyer
- 👤 Herbert A Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:35
CPC Classifications
H; H01; H01J; H01J13/00; H01J13/02; H01J13/34; H01J13/48; H01J2893/00; H01J2893/0072; H01J2893/0073; H01J2893/0074; H01J2893/0087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2190774A
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US2267398A
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US2313526A
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US2246181A
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US2266714A
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US2291092A
Cited
US2361254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-25 | 1951-11-24 | 1952-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-25 | 1955-11-24 | 1956-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-25 | 1959-11-24 | 1960-05-25 | $7700.00 | Window Closed / Lapsed |