US2445471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: SALEM ENGINEERING Co
•
Filing: 1944-05-09
•
Granted: 1948-07-20
•
Expires: 1964-05-09
Abstract
No abstract record available.
Inventors
- 👤 Robert E Buckholdt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:16
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/40; F28F1/02; F28F1/06; F28F1/105; F28F13/00; F28F13/06; F28F13/08; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/06; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US690055A
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US897661A
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US1437039A
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US1668508A
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US1797030A
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US1840724A
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US2214548A
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US2379017A
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US2378781A
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US2404647A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-20 | 1952-01-19 | 1952-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-20 | 1956-01-19 | 1956-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-20 | 1960-01-19 | 1960-07-20 | $7700.00 | Window Closed / Lapsed |