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US2467935A
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US
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Heat exchange system
Assignee: Individual
•
Filing: 1946-04-25
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Granted: 1949-04-19
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Expires: 1966-04-25
Abstract
No abstract record available.
Inventors
- 👤 Walter D Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:03
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/387
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1633601A
Cited
US1734962A
Cited
US1551029A
Cited
US1833666A
Cited
US2344588A
Cited
US2342164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-18 | 1952-10-18 | 1953-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-18 | 1956-10-18 | 1957-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-18 | 1960-10-18 | 1961-04-19 | $7700.00 | Window Closed / Lapsed |