Patent US2930233A successfully refreshed from Google Patents.
US2930233A
Expired / Lapsed
US
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Pyrometer circuit
Assignee: Lewis Engineering Co
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Filing: 1957-07-03
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Granted: 1960-03-29
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Expires: 1977-07-03
Abstract
No abstract record available.
Inventors
- 👤 Knud J Knudsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:29
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/02; G01K7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1199724A
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US1285563A
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US1912242A
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US2003681A
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US2083408A
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US2277365A
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US2883617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |