US2804284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Griscom Russell Co
•
Filing: 1953-04-03
•
Granted: 1957-08-27
•
Expires: 1973-04-03
Abstract
No abstract record available.
Inventors
- 👤 Philip S Otten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:48
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F28F1/22; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/442; Y10S165/452
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1579963A
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US1789591A
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US1886498A
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US2061100A
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US2195259A
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DE851203C
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US2311579A
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US2646971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |