US2862694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Phillips Petroleum Co
•
Filing: 1956-01-06
•
Granted: 1958-12-02
•
Expires: 1976-01-06
Abstract
No abstract record available.
Inventors
- 👤 Russell W Lortz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:55
CPC Classifications
F; F16; F16L; F16L41/00; F16L41/08; F16L41/082; F16L41/084; F28; F28F; F28F9/00; F28F9/02; F28F9/0229
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US727481A
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US1531648A
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US1631162A
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US1705546A
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US1899926A
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US1809915A
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US2213043A
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US2615688A
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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) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |