Patent US2321110A successfully refreshed from Google Patents.
US2321110A
Expired / Lapsed
US
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Heat exchanger
Assignee: Servel Inc
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Filing: 1936-08-25
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Granted: 1943-06-08
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Expires: 1956-08-25
Abstract
No abstract record available.
Inventors
- 👤 Shipman Bennet Carroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:42
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0031; F28D9/0037; F28F; F28F2250/00; F28F2250/10; F28F2250/108; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/373
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) | 1946-06-07 | 1946-12-07 | 1947-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-06-07 | 1950-12-07 | 1951-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-06-07 | 1954-12-07 | 1955-06-08 | $7700.00 | Window Closed / Lapsed |