US2744228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for reduction of amplitude variation in pulsating voltages
Assignee: Individual
•
Filing: 1951-10-01
•
Granted: 1956-05-01
•
Expires: 1971-10-01
Abstract
No abstract record available.
Inventors
- 👤 Morrison Montford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:52
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/14; H02M1/143
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1490031A
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US1965661A
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US1921063A
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US1985353A
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US2308013A
Cited
US2611874A
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US2605358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |