US2434988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange core and air duct
Assignee: Young Radiator Co
•
Filing: 1943-09-25
•
Granted: 1948-01-27
•
Expires: 1963-09-25
Abstract
No abstract record available.
Inventors
- 👤 Donald W Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:45
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/0219; F28F9/0224; B; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B21D53/085; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/05316; F28D7/00; F28D7/0058; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/471; Y10S165/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-01-26 | 1951-07-28 | 1952-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-01-26 | 1955-07-28 | 1956-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-01-26 | 1959-07-28 | 1960-01-27 | $7700.00 | Window Closed / Lapsed |