US2378646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making heat exchangers
Assignee: THERMEK Corp
•
Filing: 1942-09-19
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Granted: 1945-06-19
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Expires: 1962-09-19
Abstract
No abstract record available.
Inventors
- 👤 Lucius B Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:05
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49361; Y10T29/49377; Y10T29/49378; Y10T29/49384
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) | 1948-06-18 | 1948-12-18 | 1949-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-06-18 | 1952-12-18 | 1953-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-06-18 | 1956-12-18 | 1957-06-19 | $7700.00 | Window Closed / Lapsed |