US2783980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Young Radiator Co
•
Filing: 1953-12-08
•
Granted: 1957-03-05
•
Expires: 1973-12-08
Abstract
No abstract record available.
Inventors
- 👤 Donald W Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:18
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28D; F28D7/00; F28D7/16; F28D7/1607
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE314261C
Cited
US1289350A
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US1599370A
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US2061980A
Cited
US1994779A
Cited
US2083679A
Cited
US2202494A
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US2298996A
Cited
US2512748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |