Patent US2820218A successfully refreshed from Google Patents.
US2820218A
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Thermally sensitive detecting arrangements
Assignee: Weston Electric Instrument Corp
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Filing: 1955-09-15
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Granted: 1958-01-14
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Expires: 1975-09-15
Abstract
No abstract record available.
Inventors
- 👤 Lovegrove Henry Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:11
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/06; A; A62; A62C; A62C3/00; A62C3/07; A62C3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2473940A
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US2449304A
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US2589869A
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US2580810A
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US2731627A
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US2742634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |