Patent US2683231A successfully refreshed from Google Patents.
US2683231A
Expired / Lapsed
US
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Direct current electricity generator
Assignee: Individual
•
Filing: 1952-05-08
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Granted: 1954-07-06
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Expires: 1972-05-08
Abstract
No abstract record available.
Inventors
- 👤 James C Macfarlane
- 👤 Macfarlane James Wright
- 👤 Macfarlane William Ian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:20
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US302460A
Cited
US2102761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-05 | 1958-01-04 | 1958-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-05 | 1962-01-04 | 1962-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-05 | 1966-01-04 | 1966-07-06 | $7700.00 | Window Closed / Lapsed |