US2423175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange apparatus
Assignee: Individual
•
Filing: 1944-11-29
•
Granted: 1947-07-01
•
Expires: 1964-11-29
Abstract
No abstract record available.
Inventors
- 👤 Churchill John Adrian
- 👤 Belaieff James Frank
- 👤 Delaney Cyril Terence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:17
CPC Classifications
F; F01; F01P; F01P3/00; F01P3/18; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/401; Y10S165/405; Y10S165/412
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE299725C
Cited
US1440217A
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US1712622A
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US1872785A
Cited
US1803156A
Cited
GB407530A
Cited
FR42477E
Cited
US2111534A
Cited
US2230739A
Cited
US2171817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-30 | 1950-12-30 | 1951-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-30 | 1954-12-30 | 1955-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-30 | 1958-12-30 | 1959-07-01 | $7700.00 | Window Closed / Lapsed |