US2247243A
Expired / Lapsed
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Heat exchange element and method of making the same
Assignee: THERMEK Corp
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Filing: 1938-07-11
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Granted: 1941-06-24
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Expires: 1958-07-11
Abstract
No abstract record available.
Inventors
- 👤 Richard W Kritzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:34
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/124; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/20; B21C37/207; B21J; B21J5/00; B21J5/06; B21J5/068; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
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) | 1944-06-23 | 1944-12-23 | 1945-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-06-23 | 1948-12-23 | 1949-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-06-23 | 1952-12-23 | 1953-06-24 | $7700.00 | Window Closed / Lapsed |