Patent US2538642A successfully refreshed from Google Patents.
US2538642A
Expired / Lapsed
US
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Thermopile flame detector for combustion devices
Assignee: General Electric Co
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Filing: 1949-08-31
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Granted: 1951-01-16
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Expires: 1969-08-31
Abstract
No abstract record available.
Inventors
- 👤 Cecil M Gardiner
- 👤 Loft Arne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:28
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/26; F02C7/262
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |