US2854844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for calibrating heat responsive units
Assignee: B & H Instr Co Inc
•
Filing: 1954-05-19
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Granted: 1958-10-07
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Expires: 1974-05-19
Abstract
No abstract record available.
Inventors
- 👤 John S Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:05
CPC Classifications
G; G01; G01K; G01K15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2258809A
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US2317168A
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US2570781A
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US2535083A
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US2639305A
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US2647237A
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US2658380A
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US2758469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |