US2442560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low voltage direct-current inverter
Assignee: Individual
•
Filing: 1944-06-10
•
Granted: 1948-06-01
•
Expires: 1964-06-10
Abstract
No abstract record available.
Inventors
- 👤 Dan M Finch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:28
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US644995A
Cited
US1659729A
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US1784844A
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US1843525A
Cited
US2113164A
Cited
US2160876A
Cited
US2164541A
Cited
US2404342A
Cited
US2342628A
Cited
US2347200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-01 | 1951-12-01 | 1952-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-01 | 1955-12-01 | 1956-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-01 | 1959-12-01 | 1960-06-01 | $7700.00 | Window Closed / Lapsed |