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US2594471A
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Heat exchange apparatus
Assignee: Combustion Engineering Inc
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Filing: 1946-10-11
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Granted: 1952-04-29
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Expires: 1966-10-11
Abstract
No abstract record available.
Inventors
- 👤 Leonard J Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:37
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/36; F22D1/38; Y; Y10; Y10S; Y10S122/00; Y10S122/01; Y10S165/00; Y10S165/921
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2075044A
Cited
GB429797A
Cited
US2217512A
Cited
US2392325A
Cited
US2386188A
Cited
US2418815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |