US2961474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoelectric generator
Assignee: 3M Co
•
Filing: 1957-02-21
•
Granted: 1960-11-22
•
Expires: 1977-02-21
Abstract
No abstract record available.
Inventors
- 👤 Robert W Fritts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:21
CPC Classifications
H; H10; H10N; H10N10/00; F; F23; F23Q; F23Q9/00; G; G01; G01K; G01K7/00; G01K7/02; G01K7/04; G01K7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US511245A
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DE633828C
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US2232961A
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US2403611A
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US2525439A
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US2698352A
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US2810005A
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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) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |