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US2431080A
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Method and apparatus for combining alternating- and direct-current voltages
Assignee: JOHN JOSEPH RITTER
•
Filing: 1943-12-04
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Granted: 1947-11-18
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Expires: 1963-12-04
Abstract
No abstract record available.
Inventors
- 👤 Ritter John Joseph
- 👤 John H Ritter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:09
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/06; B23K9/073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US732616A
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US2173450A
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US2273996A
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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) | 1950-11-17 | 1951-05-19 | 1951-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-17 | 1955-05-19 | 1955-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-17 | 1959-05-19 | 1959-11-18 | $7700.00 | Window Closed / Lapsed |