US2353233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Curtis Manufacturing Co Inc
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Filing: 1941-06-04
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Granted: 1944-07-11
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Expires: 1961-06-04
Abstract
No abstract record available.
Inventors
- 👤 Gygax Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:30
CPC Classifications
F; F28; F28D; F28D5/00; F24; F24F; F24F3/00; F24F3/12; F24F3/14; F24F5/00; F24F5/0007; F24F5/0035; F28B; F28B1/00; F24F6/00; F24F6/12; F24F6/14; F24F2006/146; F25; F25B; F25B2339/00; F25B2339/04; F25B2339/041; Y; Y02; Y02B; Y02B30/00; Y02B30/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-07-11 | 1948-01-10 | 1948-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-07-11 | 1952-01-10 | 1952-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-07-11 | 1956-01-10 | 1956-07-11 | $7700.00 | Window Closed / Lapsed |