Patent US2479413A successfully refreshed from Google Patents.
US2479413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
flue heat exchanger
Assignee: —
•
Filing: —
•
Granted: 1949-08-16
•
Expires: 1966-08-16
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:25
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/26; F28F9/262; F28F9/264; Y; Y10; Y10S; Y10S165/00; Y10S165/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US62183A
Cited
US131875A
Cited
US145237A
Cited
US167129A
Cited
US221750A
Cited
US1633201A
Cited
US1797909A
Cited
US984086A
Cited
US2084408A
Cited
US2445102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-15 | 1953-02-14 | 1953-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-15 | 1957-02-14 | 1957-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-15 | 1961-02-14 | 1961-08-16 | $7700.00 | Window Closed / Lapsed |