Patent US4491431A successfully refreshed from Google Patents.
US3435451A
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Temperature difference detector
Assignee: Sunoco Inc
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Filing: 1964-08-17
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Granted: 1969-03-25
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Expires: 1984-08-17
Abstract
No abstract record available.
Inventors
- 👤 Eric A Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:30
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/02; G01K7/021; G08; G08B; G08B21/00; G08B21/18; G08B21/182
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2560829A
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US2574374A
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US2762978A
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US2897485A
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US2993172A
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US3209343A
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US3230462A
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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) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |