Patent US2872163A successfully refreshed from Google Patents.
US2872163A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Universal Oil Products Co
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Filing: 1955-11-04
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Granted: 1959-02-03
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Expires: 1975-11-04
Abstract
No abstract record available.
Inventors
- 👤 Norman H Ranstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:46
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/007; F28F9/013
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US386579A
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US1139548A
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US1652037A
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US1720768A
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GB310695A
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US1801467A
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US2165258A
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US2268730A
Cited
US2456564A
Cited
US2660410A
Cited
US2762635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |