Patent US2229344A successfully refreshed from Google Patents.
US2229344A
Expired / Lapsed
US
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Countercurrent heat exchanger
Assignee: Individual
•
Filing: 1938-11-19
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Granted: 1941-01-21
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Expires: 1958-11-19
Abstract
No abstract record available.
Inventors
- 👤 Schneider Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:24
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/006; F28; F28F; F28F9/00; F28F9/007; F28F9/013; F28F9/0135; F28F9/02; F28F9/0236; F28F9/26; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/416; Y10S165/423; Y10S165/424
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) | 1944-01-21 | 1944-07-22 | 1945-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-01-21 | 1948-07-22 | 1949-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-01-21 | 1952-07-22 | 1953-01-21 | $7700.00 | Window Closed / Lapsed |