US2590465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Griscom Russell Co
•
Filing: 1944-11-14
•
Granted: 1952-03-25
•
Expires: 1964-11-14
Abstract
No abstract record available.
Inventors
- 👤 Kenneth B Ris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:58
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1836; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00115; B01J2208/00132; B01J2208/00477; B01J2208/00495
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US307480A
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US445536A
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US856141A
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US1779538A
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US1806176A
Cited
US1884778A
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US2001663A
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US2101782A
Cited
US2250864A
Cited
US2409780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |