US2882022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Individual
•
Filing: 1955-08-02
•
Granted: 1959-04-14
•
Expires: 1975-08-02
Abstract
No abstract record available.
Inventors
- 👤 Lucien H Greathouse
- 👤 Smith Burns Ashby
- 👤 Helen M Robinson
- 👤 Chester H Haydel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:12
CPC Classifications
F; F28; F28G; F28G1/00; F28G1/08; C; C08; C08B; C08B30/00; C08B30/08; F22; F22D; F22D1/00; F22D1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1668577A
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US2233066A
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US321541A
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US440410A
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US443186A
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US2733767A
Cited
US13628A
Cited
US273777A
Cited
US810441A
Cited
US1116953A
Cited
US1581545A
Cited
US1621289A
Cited
US1770208A
Cited
US1686715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |