Patent US2525407A successfully refreshed from Google Patents.
US2525407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace
Assignee: Individual
•
Filing: 1947-04-25
•
Granted: 1950-10-10
•
Expires: 1967-04-25
Abstract
No abstract record available.
Inventors
- 👤 Jr John Frei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:55
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/08; F; F27; F27B; F27B17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US379927A
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US741430A
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US1354286A
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US1627841A
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GB282799A
Cited
US1903909A
Cited
US2149813A
Cited
US2175784A
Cited
US2220002A
Cited
US2273500A
Cited
US2360348A
Cited
US2417063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |